The United players appealed for an infringement by Didier Drogba on Terry’s goal in the 76th minute.
“The referee was in a ridiculous position – he couldn’t see anything,” he told Sky Sports.
“He had a Chelsea player standing right in front of him and he didn’t even move.
“It was a bad decision.”
He continued: “That goal should not have been allowed.
“We dominated the game, we had great chances to win the match.
“We had great opportunities in terms of the football we played to get in and around the box.
“We should be finishing it off much better, we only have ourselves to blame for that.”
He added: “The fact that Chelsea have gone five points clear of us is a concern.”
