diff --git a/homeassistant/components/mqtt/sensor.py b/homeassistant/components/mqtt/sensor.py
index eac136d3f84..16c19c8fc51 100644
--- a/homeassistant/components/mqtt/sensor.py
+++ b/homeassistant/components/mqtt/sensor.py
@@ -53,18 +53,23 @@ MQTT_SENSOR_ATTRIBUTES_BLOCKED = frozenset(
 
 DEFAULT_NAME = "MQTT Sensor"
 DEFAULT_FORCE_UPDATE = False
-PLATFORM_SCHEMA = mqtt.MQTT_RO_PLATFORM_SCHEMA.extend(
-    {
-        vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
-        vol.Optional(CONF_EXPIRE_AFTER): cv.positive_int,
-        vol.Optional(CONF_FORCE_UPDATE, default=DEFAULT_FORCE_UPDATE): cv.boolean,
-        vol.Optional(CONF_LAST_RESET_TOPIC): mqtt.valid_subscribe_topic,
-        vol.Optional(CONF_LAST_RESET_VALUE_TEMPLATE): cv.template,
-        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
-        vol.Optional(CONF_STATE_CLASS): STATE_CLASSES_SCHEMA,
-        vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
-    }
-).extend(MQTT_ENTITY_COMMON_SCHEMA.schema)
+PLATFORM_SCHEMA = vol.All(
+    # Deprecated, remove in Home Assistant 2021.11
+    cv.deprecated(CONF_LAST_RESET_TOPIC),
+    cv.deprecated(CONF_LAST_RESET_VALUE_TEMPLATE),
+    mqtt.MQTT_RO_PLATFORM_SCHEMA.extend(
+        {
+            vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
+            vol.Optional(CONF_EXPIRE_AFTER): cv.positive_int,
+            vol.Optional(CONF_FORCE_UPDATE, default=DEFAULT_FORCE_UPDATE): cv.boolean,
+            vol.Optional(CONF_LAST_RESET_TOPIC): mqtt.valid_subscribe_topic,
+            vol.Optional(CONF_LAST_RESET_VALUE_TEMPLATE): cv.template,
+            vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+            vol.Optional(CONF_STATE_CLASS): STATE_CLASSES_SCHEMA,
+            vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
+        }
+    ).extend(MQTT_ENTITY_COMMON_SCHEMA.schema),
+)
 
 
 async def async_setup_platform(
diff --git a/tests/components/mqtt/test_sensor.py b/tests/components/mqtt/test_sensor.py
index 15ca9870077..724dec1c93f 100644
--- a/tests/components/mqtt/test_sensor.py
+++ b/tests/components/mqtt/test_sensor.py
@@ -306,6 +306,28 @@ async def test_setting_sensor_last_reset_via_mqtt_json_message(hass, mqtt_mock):
     assert state.attributes.get("last_reset") == "2020-01-02T08:11:00"
 
 
+async def test_last_reset_deprecated(hass, mqtt_mock, caplog):
+    """Test the setting of the last_reset property via MQTT."""
+    assert await async_setup_component(
+        hass,
+        sensor.DOMAIN,
+        {
+            sensor.DOMAIN: {
+                "platform": "mqtt",
+                "name": "test",
+                "state_topic": "test-topic",
+                "unit_of_measurement": "fav unit",
+                "last_reset_topic": "last-reset-topic",
+                "last_reset_value_template": "{{ value_json.last_reset }}",
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    assert "The 'last_reset_topic' option is deprecated" in caplog.text
+    assert "The 'last_reset_value_template' option is deprecated" in caplog.text
+
+
 async def test_force_update_disabled(hass, mqtt_mock):
     """Test force update option."""
     assert await async_setup_component(