Sir Alex Ferguson felt United had a little slice of luck with Javier Hernandez's winner at Chelsea as TV replays showed the substitute was marginally offside when converting Rafael's driven cross.
However, the boss had little sympathy for Fernando Torres after the striker was shown a second yellow card for simulation, leaving the Barclays Premier League leaders down to 10 men.
"It's 10 years since we won here [in the league]," he told Sky Sports after the 3-2 triumph. "I said before the game that we've had some shocking decisions down here. It's very difficult to come here and get all the decisions as it's a very difficult place. The crowd played a part, they were terrific and right behind their team, and we buckled in the minutes before and after half time.
"I think we gathered ourselves well and got back into the game. They said the winning goal could have been offside, so that's a bit of luck we got, but we started the game so well. We were absolutely brilliant but then, 10 minutes from half time, we lost our way a bit. I couldn't wait for half time, to be honest, then they got the second goal and, from that moment, we had to start performing properly and I think we did that."
Sir Alex was asked on his views of the red cards for Branislav Ivanovic, for a blatant trip on Ashley Young, and Torres.
"The sending off of the right-back was the turning point for us," added the manager. "I think we would have won it from that point. I put Chicharito on and he got the winning goal as I think the momentum was with us then.