diff --git a/x-pack/plugins/task_manager/server/config.ts b/x-pack/plugins/task_manager/server/config.ts
index 157f01281836d..a22c4484389ae 100644
--- a/x-pack/plugins/task_manager/server/config.ts
+++ b/x-pack/plugins/task_manager/server/config.ts
@@ -6,6 +6,7 @@
 
 import { schema, TypeOf } from '@kbn/config-schema';
 
+export const MAX_WORKERS_LIMIT = 100;
 export const DEFAULT_MAX_WORKERS = 10;
 export const DEFAULT_POLL_INTERVAL = 3000;
 export const DEFAULT_MAX_POLL_INACTIVITY_CYCLES = 10;
diff --git a/x-pack/plugins/task_manager/server/index.test.ts b/x-pack/plugins/task_manager/server/index.test.ts
index 3f25f4403d358..873950f229147 100644
--- a/x-pack/plugins/task_manager/server/index.test.ts
+++ b/x-pack/plugins/task_manager/server/index.test.ts
@@ -40,4 +40,13 @@ describe('deprecations', () => {
       `);
     });
   });
+
+  it('logs a warning if max_workers is over limit', () => {
+    const { messages } = applyTaskManagerDeprecations({ max_workers: 1000 });
+    expect(messages).toMatchInlineSnapshot(`
+      Array [
+        "setting \\"xpack.task_manager.max_workers\\" (1000) greater than 100 is deprecated. Values greater than 100 will not be supported starting in 8.0.",
+      ]
+    `);
+  });
 });
diff --git a/x-pack/plugins/task_manager/server/index.ts b/x-pack/plugins/task_manager/server/index.ts
index 8f96e10430b39..1696a3ec69c05 100644
--- a/x-pack/plugins/task_manager/server/index.ts
+++ b/x-pack/plugins/task_manager/server/index.ts
@@ -7,7 +7,7 @@
 import { get } from 'lodash';
 import { PluginConfigDescriptor, PluginInitializerContext } from 'src/core/server';
 import { TaskManagerPlugin } from './plugin';
-import { configSchema, TaskManagerConfig } from './config';
+import { configSchema, TaskManagerConfig, MAX_WORKERS_LIMIT } from './config';
 
 export const plugin = (initContext: PluginInitializerContext) => new TaskManagerPlugin(initContext);
 
@@ -37,6 +37,11 @@ export const config: PluginConfigDescriptor<TaskManagerConfig> = {
           `"${fromPath}.index" is deprecated. Multitenancy by changing "kibana.index" will not be supported starting in 8.0. See https://ela.st/kbn-remove-legacy-multitenancy for more details`
         );
       }
+      if (taskManager?.max_workers > MAX_WORKERS_LIMIT) {
+        log(
+          `setting "${fromPath}.max_workers" (${taskManager?.max_workers}) greater than ${MAX_WORKERS_LIMIT} is deprecated. Values greater than ${MAX_WORKERS_LIMIT} will not be supported starting in 8.0.`
+        );
+      }
       return settings;
     },
   ],