After his sending off, Wenger was unaware of where to go and firstly moved to the Arsenal dugout and then the main stand at Old Trafford before being ushered along the touchline to the tunnel as the game concluded.
Wenger demonstrated his frustration in the final seconds of the match when his side were denied a late equaliser when William Gallas was adjudged offside in the build up to Robin Van Persie's side-foot finish.
Wenger afterwards admitted that he had kicked the bottle not out of anger at the decision to rule out the goal but disappointment at his side's failure to get the equaliser.
Arsenal had earlier taken a first-half lead in the match courtesy of an Andriy Arshavin goal, only to see United hit back to take the lead through a Wayne Rooney penalty and an own goal from Abou Diaby.
Wenger was also unhappy with Dean's decision earlier in the match not to award his side a penalty for Darren Fletcher's untidy tackle on Arshavin.
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