diff --git a/homeassistant/components/telegram_bot/__init__.py b/homeassistant/components/telegram_bot/__init__.py
index f744265e1c2..fa3ec1dc4f7 100644
--- a/homeassistant/components/telegram_bot/__init__.py
+++ b/homeassistant/components/telegram_bot/__init__.py
@@ -175,6 +175,7 @@ BASE_SERVICE_SCHEMA = vol.Schema(
         vol.Optional(ATTR_KEYBOARD_INLINE): cv.ensure_list,
         vol.Optional(ATTR_TIMEOUT): cv.positive_int,
         vol.Optional(ATTR_MESSAGE_TAG): cv.string,
+        vol.Optional(ATTR_MESSAGE_THREAD_ID): vol.Coerce(int),
     },
     extra=vol.ALLOW_EXTRA,
 )
@@ -216,6 +217,7 @@ SERVICE_SCHEMA_SEND_POLL = vol.Schema(
         vol.Optional(ATTR_ALLOWS_MULTIPLE_ANSWERS, default=False): cv.boolean,
         vol.Optional(ATTR_DISABLE_NOTIF): cv.boolean,
         vol.Optional(ATTR_TIMEOUT): cv.positive_int,
+        vol.Optional(ATTR_MESSAGE_THREAD_ID): vol.Coerce(int),
     }
 )
 
diff --git a/tests/components/telegram_bot/test_telegram_bot.py b/tests/components/telegram_bot/test_telegram_bot.py
index be6b5b31325..c9038003cfc 100644
--- a/tests/components/telegram_bot/test_telegram_bot.py
+++ b/tests/components/telegram_bot/test_telegram_bot.py
@@ -184,7 +184,7 @@ async def test_send_message_thread(hass: HomeAssistant, webhook_platform) -> Non
 
     assert len(events) == 1
     assert events[0].context == context
-    assert events[0].data[ATTR_MESSAGE_THREAD_ID] == "123"
+    assert events[0].data[ATTR_MESSAGE_THREAD_ID] == 123
 
 
 async def test_webhook_endpoint_generates_telegram_text_event(