diff --git a/src/libs/ReportUtils.ts b/src/libs/ReportUtils.ts
index 14d13da15db1..999e44f8bdb6 100644
--- a/src/libs/ReportUtils.ts
+++ b/src/libs/ReportUtils.ts
@@ -10797,16 +10797,18 @@ function getNonHeldAndFullAmount(iouReport: OnyxEntry<Report>, shouldExcludeNonR
  * - The action is a whisper action and it's neither a report preview nor IOU action
  * - The action is the thread's first chat
  */
-function shouldDisableThread(reportAction: OnyxInputOrEntry<ReportAction>, reportID: string, isThreadReportParentAction: boolean, isReportArchived = false): boolean {
+function shouldDisableThread(reportAction: OnyxInputOrEntry<ReportAction>, isThreadReportParentAction: boolean, isReportArchived = false): boolean {
     const isSplitBillAction = isSplitBillReportAction(reportAction);
     const isDeletedActionLocal = isDeletedAction(reportAction);
     const isReportPreviewActionLocal = isReportPreviewAction(reportAction);
     const isIOUAction = isMoneyRequestAction(reportAction);
     const isWhisperActionLocal = isWhisperAction(reportAction) || isActionableTrackExpense(reportAction);
     const isActionDisabled = CONST.REPORT.ACTIONS.THREAD_DISABLED.some((action: string) => action === reportAction?.actionName);
+    const isManagerMcTestOwner = reportAction?.actorAccountID === CONST.ACCOUNT_ID.MANAGER_MCTEST;
 
     return (
         isActionDisabled ||
+        isManagerMcTestOwner ||
         isSplitBillAction ||
         (isDeletedActionLocal && !reportAction?.childVisibleActionCount) ||
         (isReportArchived && !reportAction?.childVisibleActionCount) ||
diff --git a/src/pages/home/report/ContextMenu/ContextMenuActions.tsx b/src/pages/home/report/ContextMenu/ContextMenuActions.tsx
index 493ec6a7a90a..1b44c0d6d72f 100644
--- a/src/pages/home/report/ContextMenu/ContextMenuActions.tsx
+++ b/src/pages/home/report/ContextMenu/ContextMenuActions.tsx
@@ -346,7 +346,7 @@ const ContextMenuActions: ContextMenuAction[] = [
             if (type !== CONST.CONTEXT_MENU_TYPES.REPORT_ACTION || !reportID) {
                 return false;
             }
-            return !shouldDisableThread(reportAction, reportID, isThreadReportParentAction, isArchivedRoom);
+            return !shouldDisableThread(reportAction, isThreadReportParentAction, isArchivedRoom);
         },
         onPress: (closePopover, {reportAction, reportID}) => {
             const originalReportID = getOriginalReportID(reportID, reportAction);
@@ -486,6 +486,7 @@ const ContextMenuActions: ContextMenuAction[] = [
             const isExpenseReportAction = isMoneyRequestAction(reportAction) || isReportPreviewActionReportActionsUtils(reportAction);
             const isTaskAction = isCreatedTaskReportAction(reportAction);
             const isHarvestCreatedExpenseReportAction = isHarvestReport && isCreatedAction(reportAction);
+            const shouldDisableJoinThread = shouldDisableThread(reportAction, isThreadReportParentAction, isArchivedRoom);
             return (
                 !subscribed &&
                 !isWhisperAction &&
@@ -493,6 +494,7 @@ const ContextMenuActions: ContextMenuAction[] = [
                 !isExpenseReportAction &&
                 !isThreadReportParentAction &&
                 !isHarvestCreatedExpenseReportAction &&
+                !shouldDisableJoinThread &&
                 (shouldDisplayThreadReplies || (!isDeletedAction && !isArchivedRoom))
             );
         },
diff --git a/tests/unit/ReportUtilsTest.ts b/tests/unit/ReportUtilsTest.ts
index 0646035a2663..e7918e5c4307 100644
--- a/tests/unit/ReportUtilsTest.ts
+++ b/tests/unit/ReportUtilsTest.ts
@@ -3341,7 +3341,7 @@ describe('ReportUtils', () => {
 
         it('should disable on thread-disabled actions', () => {
             const reportAction = buildOptimisticCreatedReportAction('email1@test.com');
-            expect(shouldDisableThread(reportAction, reportID, false)).toBeTruthy();
+            expect(shouldDisableThread(reportAction, false)).toBeTruthy();
         });
 
         it('should disable thread on split expense actions', () => {
@@ -3353,7 +3353,7 @@ describe('ReportUtils', () => {
                 participants: [{login: 'email1@test.com'}, {login: 'email2@test.com'}],
                 transactionID: NumberUtils.rand64(),
             }) as ReportAction;
-            expect(shouldDisableThread(reportAction, reportID, false)).toBeTruthy();
+            expect(shouldDisableThread(reportAction, false)).toBeTruthy();
         });
 
         it("should disable on a whisper action and it's neither a report preview nor IOU action", () => {
@@ -3363,14 +3363,37 @@ describe('ReportUtils', () => {
                     whisperedTo: [123456],
                 },
             } as ReportAction;
-            expect(shouldDisableThread(reportAction, reportID, false)).toBeTruthy();
+            expect(shouldDisableThread(reportAction, false)).toBeTruthy();
         });
 
         it('should disable on thread first chat', () => {
             const reportAction = {
                 childReportID: reportID,
             } as ReportAction;
-            expect(shouldDisableThread(reportAction, reportID, true)).toBeTruthy();
+            expect(shouldDisableThread(reportAction, true)).toBeTruthy();
+        });
+
+        it('should disable thread for messages sent by MANAGER_MCTEST', () => {
+            // Given a report action from MANAGER_MCTEST
+            const reportAction = {
+                actorAccountID: CONST.ACCOUNT_ID.MANAGER_MCTEST,
+                message: [
+                    {
+                        translationKey: '',
+                        type: 'COMMENT',
+                        html: 'Test message from Manager McTest',
+                        text: 'Test message from Manager McTest',
+                    },
+                ],
+                actionName: CONST.REPORT.ACTIONS.TYPE.ADD_COMMENT,
+            } as ReportAction;
+
+            // When it's checked to see if the thread should be disabled
+            const isThreadDisabled = shouldDisableThread(reportAction, false);
+
+            // Then the thread should be disabled
+            // This ensures "Reply in thread" and "Join thread" context menu options won't be shown
+            expect(isThreadDisabled).toBeTruthy();
         });
 
         describe('deleted threads', () => {
@@ -3389,7 +3412,7 @@ describe('ReportUtils', () => {
                 } as ReportAction;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false);
+                const isThreadDisabled = shouldDisableThread(reportAction, false);
 
                 // Then the thread should be enabled
                 expect(isThreadDisabled).toBeFalsy();
@@ -3410,7 +3433,7 @@ describe('ReportUtils', () => {
                 } as ReportAction;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false);
+                const isThreadDisabled = shouldDisableThread(reportAction, false);
 
                 // Then the thread should be enabled
                 expect(isThreadDisabled).toBeFalsy();
@@ -3430,7 +3453,7 @@ describe('ReportUtils', () => {
                 } as ReportAction;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false);
+                const isThreadDisabled = shouldDisableThread(reportAction, false);
 
                 // Then the thread should be enabled
                 expect(isThreadDisabled).toBeFalsy();
@@ -3451,7 +3474,7 @@ describe('ReportUtils', () => {
                 } as ReportAction;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false);
+                const isThreadDisabled = shouldDisableThread(reportAction, false);
 
                 // Then the thread should be disabled
                 expect(isThreadDisabled).toBeTruthy();
@@ -3477,7 +3500,7 @@ describe('ReportUtils', () => {
                 const isReportArchived = false;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false, isReportArchived);
+                const isThreadDisabled = shouldDisableThread(reportAction, false, isReportArchived);
 
                 // Then the thread should be enabled
                 expect(isThreadDisabled).toBeFalsy();
@@ -3500,7 +3523,7 @@ describe('ReportUtils', () => {
                 const isReportArchived = false;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false, isReportArchived);
+                const isThreadDisabled = shouldDisableThread(reportAction, false, isReportArchived);
 
                 // Then the thread should be enabled
                 expect(isThreadDisabled).toBeFalsy();
@@ -3523,7 +3546,7 @@ describe('ReportUtils', () => {
                 const isReportArchived = true;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false, isReportArchived);
+                const isThreadDisabled = shouldDisableThread(reportAction, false, isReportArchived);
 
                 // Then the thread should be enabled
                 expect(isThreadDisabled).toBeFalsy();
@@ -3546,7 +3569,7 @@ describe('ReportUtils', () => {
                 const isReportArchived = true;
 
                 // When it's checked to see if the thread should be disabled
-                const isThreadDisabled = shouldDisableThread(reportAction, reportID, false, isReportArchived);
+                const isThreadDisabled = shouldDisableThread(reportAction, false, isReportArchived);
 
                 // Then the thread should be disabled
                 expect(isThreadDisabled).toBeTruthy();