diff --git a/CHANGELOG.md b/CHANGELOG.md
index 811f659948ce..e35fad0ddb75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
+- ref(hub): Remove `_invokeClient` (#4195)
+- **breaking** feat(minimal): Remove `_callOnClient` (#4195)
+
+`_callOnClient` was a hidden API that was not meant for public use. If this breaks your set up, please write a GitHub issue describing your usage of `_callOnClient` and we can re-evaluate accordingly.
+
 ## 6.15.0
 
 - fix(browser): Capture stacktrace on `DOMExceptions`, if possible (#4160)
diff --git a/packages/hub/src/hub.ts b/packages/hub/src/hub.ts
index 2c1f6b297faf..6c5173d0d1c4 100644
--- a/packages/hub/src/hub.ts
+++ b/packages/hub/src/hub.ts
@@ -206,9 +206,8 @@ export class Hub implements HubInterface {
       };
     }
 
-    this._invokeClient('captureException', exception, {
-      ...finalHint,
-      event_id: eventId,
+    this._withClient((client, scope) => {
+      client.captureException(exception, { ...finalHint, event_id: eventId }, scope);
     });
     return eventId;
   }
@@ -237,9 +236,8 @@ export class Hub implements HubInterface {
       };
     }
 
-    this._invokeClient('captureMessage', message, level, {
-      ...finalHint,
-      event_id: eventId,
+    this._withClient((client, scope) => {
+      client.captureMessage(message, level, { ...finalHint, event_id: eventId }, scope);
     });
     return eventId;
   }
@@ -253,9 +251,8 @@ export class Hub implements HubInterface {
       this._lastEventId = eventId;
     }
 
-    this._invokeClient('captureEvent', event, {
-      ...hint,
-      event_id: eventId,
+    this._withClient((client, scope) => {
+      client.captureEvent(event, { ...hint, event_id: eventId }, scope);
     });
     return eventId;
   }
@@ -476,15 +473,13 @@ export class Hub implements HubInterface {
   /**
    * Internal helper function to call a method on the top client if it exists.
    *
-   * @param method The method to call on the client.
-   * @param args Arguments to pass to the client function.
+   * @param callback Callback that gets passed client and scope from stack
    */
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  private _invokeClient<M extends keyof Client>(method: M, ...args: any[]): void {
+  private _withClient(callback: (client: Client, scope: Scope | undefined) => void): void {
     const { scope, client } = this.getStackTop();
-    if (client && client[method]) {
-      // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access, @typescript-eslint/no-explicit-any
-      (client as any)[method](...args, scope);
+    if (client) {
+      callback(client, scope);
     }
   }
 
diff --git a/packages/hub/test/hub.test.ts b/packages/hub/test/hub.test.ts
index 4e865fa10412..becbcbffe591 100644
--- a/packages/hub/test/hub.test.ts
+++ b/packages/hub/test/hub.test.ts
@@ -27,13 +27,6 @@ describe('Hub', () => {
     expect(hub.getStack()).toHaveLength(1);
   });
 
-  test("don't invoke client sync with wrong func", () => {
-    const hub = new Hub(clientFn);
-    // @ts-ignore we want to able to call private method
-    hub._invokeClient('funca', true);
-    expect(clientFn).not.toHaveBeenCalled();
-  });
-
   test('isOlderThan', () => {
     const hub = new Hub();
     expect(hub.isOlderThan(0)).toBeFalsy();
@@ -194,101 +187,94 @@ describe('Hub', () => {
   });
 
   describe('captureException', () => {
+    const mockClient: any = { captureException: jest.fn() };
+    beforeEach(() => {
+      mockClient.captureException.mockClear();
+    });
+
     test('simple', () => {
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureException('a');
-      expect(spy).toHaveBeenCalled();
-      expect(spy.mock.calls[0][0]).toBe('captureException');
-      expect(spy.mock.calls[0][1]).toBe('a');
+      expect(mockClient.captureException).toHaveBeenCalled();
+      expect(mockClient.captureException.mock.calls[0][0]).toBe('a');
     });
 
     test('should set event_id in hint', () => {
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureException('a');
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].event_id).toBeTruthy();
+      expect(mockClient.captureException.mock.calls[0][1].event_id).toBeTruthy();
     });
 
     test('should generate hint if not provided in the call', () => {
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       const ex = new Error('foo');
       hub.captureException(ex);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].originalException).toBe(ex);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].syntheticException).toBeInstanceOf(Error);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].syntheticException.message).toBe('Sentry syntheticException');
+      expect(mockClient.captureException.mock.calls[0][1].originalException).toBe(ex);
+      expect(mockClient.captureException.mock.calls[0][1].syntheticException).toBeInstanceOf(Error);
+      expect(mockClient.captureException.mock.calls[0][1].syntheticException.message).toBe('Sentry syntheticException');
     });
   });
 
   describe('captureMessage', () => {
+    const mockClient: any = { captureMessage: jest.fn() };
+    beforeEach(() => {
+      mockClient.captureMessage.mockClear();
+    });
+
     test('simple', () => {
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureMessage('a');
-      expect(spy).toHaveBeenCalled();
-      expect(spy.mock.calls[0][0]).toBe('captureMessage');
-      expect(spy.mock.calls[0][1]).toBe('a');
+      expect(mockClient.captureMessage).toHaveBeenCalled();
+      expect(mockClient.captureMessage.mock.calls[0][0]).toBe('a');
     });
 
     test('should set event_id in hint', () => {
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureMessage('a');
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][3].event_id).toBeTruthy();
+      expect(mockClient.captureMessage.mock.calls[0][2].event_id).toBeTruthy();
     });
 
     test('should generate hint if not provided in the call', () => {
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureMessage('foo');
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][3].originalException).toBe('foo');
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][3].syntheticException).toBeInstanceOf(Error);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][3].syntheticException.message).toBe('foo');
+      expect(mockClient.captureMessage.mock.calls[0][2].originalException).toBe('foo');
+      expect(mockClient.captureMessage.mock.calls[0][2].syntheticException).toBeInstanceOf(Error);
+      expect(mockClient.captureMessage.mock.calls[0][2].syntheticException.message).toBe('foo');
     });
   });
 
   describe('captureEvent', () => {
+    const mockClient: any = { captureEvent: jest.fn() };
+    beforeEach(() => {
+      mockClient.captureEvent.mockClear();
+    });
+
     test('simple', () => {
       const event: Event = {
         extra: { b: 3 },
       };
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureEvent(event);
-      expect(spy).toHaveBeenCalled();
-      expect(spy.mock.calls[0][0]).toBe('captureEvent');
-      expect(spy.mock.calls[0][1]).toBe(event);
+      expect(mockClient.captureEvent).toHaveBeenCalled();
+      expect(mockClient.captureEvent.mock.calls[0][0]).toBe(event);
     });
 
     test('should set event_id in hint', () => {
       const event: Event = {
         extra: { b: 3 },
       };
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureEvent(event);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].event_id).toBeTruthy();
+      expect(mockClient.captureEvent.mock.calls[0][1].event_id).toBeTruthy();
     });
 
     test('sets lastEventId', () => {
       const event: Event = {
         extra: { b: 3 },
       };
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureEvent(event);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].event_id).toEqual(hub.lastEventId());
+      expect(mockClient.captureEvent.mock.calls[0][1].event_id).toEqual(hub.lastEventId());
     });
 
     test('transactions do not set lastEventId', () => {
@@ -296,11 +282,9 @@ describe('Hub', () => {
         extra: { b: 3 },
         type: 'transaction',
       };
-      const hub = new Hub();
-      const spy = jest.spyOn(hub as any, '_invokeClient');
+      const hub = new Hub(mockClient);
       hub.captureEvent(event);
-      // @ts-ignore Says mock object is type unknown
-      expect(spy.mock.calls[0][2].event_id).not.toEqual(hub.lastEventId());
+      expect(mockClient.captureEvent.mock.calls[0][1].event_id).not.toEqual(hub.lastEventId());
     });
   });
 
diff --git a/packages/minimal/src/index.ts b/packages/minimal/src/index.ts
index 117c8a769b92..7325c95cb97d 100644
--- a/packages/minimal/src/index.ts
+++ b/packages/minimal/src/index.ts
@@ -179,21 +179,6 @@ export function withScope(callback: (scope: Scope) => void): void {
   callOnHub<void>('withScope', callback);
 }
 
-/**
- * Calls a function on the latest client. Use this with caution, it's meant as
- * in "internal" helper so we don't need to expose every possible function in
- * the shim. It is not guaranteed that the client actually implements the
- * function.
- *
- * @param method The method to call on the client/client.
- * @param args Arguments to pass to the client/fontend.
- * @hidden
- */
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export function _callOnClient(method: string, ...args: any[]): void {
-  callOnHub<void>('_invokeClient', method, ...args);
-}
-
 /**
  * Starts a new `Transaction` and returns it. This is the entry point to manual tracing instrumentation.
  *
diff --git a/packages/minimal/test/lib/minimal.test.ts b/packages/minimal/test/lib/minimal.test.ts
index 9e25bb0a46df..c82a26faae74 100644
--- a/packages/minimal/test/lib/minimal.test.ts
+++ b/packages/minimal/test/lib/minimal.test.ts
@@ -2,7 +2,6 @@ import { getCurrentHub, getHubFromCarrier, Scope } from '@sentry/hub';
 import { Severity } from '@sentry/types';
 
 import {
-  _callOnClient,
   captureEvent,
   captureException,
   captureMessage,
@@ -197,17 +196,6 @@ describe('Minimal', () => {
     expect(getCurrentHub().getClient()).toBe(TestClient.instance);
   });
 
-  test('Calls function on the client', done => {
-    const s = jest.spyOn(TestClient.prototype, 'mySecretPublicMethod');
-    getCurrentHub().withScope(() => {
-      getCurrentHub().bindClient(new TestClient({}) as any);
-      _callOnClient('mySecretPublicMethod', 'test');
-      expect(s.mock.calls[0][0]).toBe('test');
-      s.mockRestore();
-      done();
-    });
-  });
-
   test('does not throw an error when pushing different clients', () => {
     init({});
     expect(() => {