diff --git a/telethon/extensions/tcpclient.py b/telethon/extensions/tcpclient.py
index f24dec40..1501d295 100644
--- a/telethon/extensions/tcpclient.py
+++ b/telethon/extensions/tcpclient.py
@@ -151,7 +151,14 @@ class TcpClient:
             loop=self._loop
         )
         for r in running:
-            r.cancel()
+            if not r.cancelled():
+                if r.done():
+                    # Retrieve exception to avoid "not retrieved" errors
+                    r.exception()
+
+                # Cancel the future despite its state
+                r.cancel()
+
         if not self.is_connected:
             raise self.SocketClosed()
         if not done:
diff --git a/telethon/network/mtprotosender.py b/telethon/network/mtprotosender.py
index cf19ecb4..315ecf12 100644
--- a/telethon/network/mtprotosender.py
+++ b/telethon/network/mtprotosender.py
@@ -167,7 +167,7 @@ class MTProtoSender:
                 self._recv_loop_handle.cancel()
 
         __log__.info('Disconnection from {} complete!'.format(self._ip))
-        if self._disconnected:
+        if self._disconnected and not self._disconnected.done():
             if error:
                 self._disconnected.set_exception(error)
             else: