Arsenal vice-captain Per Mertesacker has revealed that Danny Welbeck cut a sombre figure in the winning dressing room at Old Trafford last night, despite producing the decisive moment of the match to help the Gunners secure a 2-1 win over his former club.
Welbeck marked a return to his boyhood club by seizing on a mistake from Antonio Valencia to put Arsenal ahead, a moment he savoured with a celebration that showed how important the goal was to him without overstepping the mark.
Perhaps the enormity of playing against a club he joined at the age of eight hit home after the full-time whistle went, with Mertesacker sharing that he had to lift an 'upset' Welbeck and remind him there's plenty to look forward to at Arsenal as he approaches the prime years of what remains a very promising career.
Time for reflection
After last night's FA Cup heroics Mertesacker spoke to the Daily Star, conceding: "Danny Welbeck was a great player here at United, he's a bit quiet in the dressing room at the moment.
"I think it hurts him a bit as well as he was here for a long time. We tried to get him going and to tell him he can enjoy special moments with Arsenal."
Welbeck handled occasion brilliantly
Arsenal fans can be proud of Welbeck's performance last night, working tirelessly and remaining focused on the task at hand despite what must have been an emotional return to Old Trafford.
Welbeck will hope to take the positives from a tireless, match-winning display as momentum to build on for the rest of the season, because competition for places in attacking positions at Arsenal is fierce.
Wenger explains Welbeck call
Gunners boss Arsene Wenger was in a much better mood following Arsenal's biggest win of the season and had reason to feel vindicated, after surprising many with his decision to pick Welbeck to lead the line ahead of in-form Olivier Giroud.
Welbeck came up with the goods and so did another slightly surprising selection in Nacho Monreal, who opened the scoring after getting the nod ahead of Kieran Gibbs.
Wenger believes that rotation is key, but also conceded that there was a touch of sentiment about opting for Welbeck because he knew the £16m man would be highly motivated to perform.
Transfer decision to ponder
Away from the buzz of a long overdue success at Old Trafford the Frenchman has a big transfer decision to ponder, will he allow Carl Jenksinon to complete a summer switch to West Ham United?
The Mail report this morning that Arsenal have put a £10m pricetag on Jenkinson's head, which if not met will mean he returns to the Emirates to fight for his place next season.
Jenkinson has been impressive this season and West Ham want him as part of the club's long-term plan to become a permanent fixture in the top of the table, but that price tag may prove a sticking point.
More pressingly though Arsenal have a Premier League fixture to prepare for this weekend, one which Jenkinson will play no part in under the terms of his loan agreement.
Arsenal fans, how pleased were you with Welbeck's efforts last night? Can you understand why he was upset in the changing room despite being on the winning side? Let us know your thoughts on last night's success in the comment box below.