diff --git a/aiohttp/client_reqrep.py b/aiohttp/client_reqrep.py
index 9478e8d36c5..0621c971340 100644
--- a/aiohttp/client_reqrep.py
+++ b/aiohttp/client_reqrep.py
@@ -698,6 +698,7 @@ def __init__(
 
         self.method = method
         self.cookies: SimpleCookie[str] = SimpleCookie()
+        self.certficate: Optional[Dict[str, Union[tuple, int, str]]] = None
 
         self._real_url = url
         self._url = url.with_fragment(None)
@@ -887,6 +888,7 @@ def _response_eof(self) -> None:
             return
 
         if self._connection is not None:
+            self.certificate = self._connection.transport.get_extra_info("peercert")
             # websocket, protocol could be None because
             # connection could be detached
             if (