Arsenal manager Arsene Wenger hinted that referee Mike Dean had been swayed by the Old Trafford atmosphere as his side suffered a controversial 2-1 defeat at Manchester United on Saturday.
Just 24 hours after Wenger raged at UEFA for starting disciplinary action against Gunners striker Eduardo for his dive against Celtic, the French coach was infuriated by Dean's decision to award United a penalty that Wayne Rooney converted to cancel out Andrey Arshavin's opener.
Dean gave United a spot-kick when Arsenal goalkeeper Manuel Almunia's rushed out to challenge Rooney and had earlier ruled that Darren Fletcher's rash lunge on Arshavin was not penalty.
Wenger then had to suffer the added agony of seeing Robin van Persie's stoppage time strike ruled out as William Gallas was offside.
The Arsenal boss reacted by kicking a water bottle on the touchline and was sent to the stands.
Asked if he thought Dean got the penalty decisions right, Wenger told Sky Sports: "You should ask the referee. You know what you get at Old Trafford but I don't want to go into the performance of the referee.
"I don't know if we should have had a penalty but I don't know if they should either.
"I kicked a bottle when the goal was cancelled for offside. I didn't know you can't do that."
While Wenger fumed, United boss Sir Alex Ferguson was delighted with the way his side battled back to win their first clash with a big-four rival this season.
"When you are 1-0 down to a team of Arsenal's class it's an uphill task," Ferguson said. "We had to dig deep and we got break with the own goal but it was a clear penalty and we really performed well in the second half.
"The players know winning big games is important. Last season we lost four points to Arsenal and six to Liverpool. Now we've got off to a better start against the bigger teams. That can make a difference.
"Darren Fletcher was the outstanding player. He gave a marvellous performance. He's a big game player and always does well on these occasions."