But Romelu Lukaku has handed manager Jose Mourinho a timely boost ahead of the Wembley showpiece with the Belgium striker due to return to training on Tuesday following an ankle injury sustained a fortnight ago.
The 36-year-old midfielder was signed by Sir Alex Ferguson from Spurs for £18 million in 2006 and has enjoyed a hugely successful spell with United winning five Premier League titles, one Club World Cup, one Champions League, one Europa League, one FA Cup and three League Cups.
Mourinho said on the United website that 42-year-old Faria, who he has worked with since 2001, was ideally situated now to become a manager in his own right. "He'll teach me some things and we're going to have some success in the near future, I'm certain of that".
Carrick said: "I have to thank the manager an very bad lot".
"I don't think it (an immediate appointment) makes sense when Rui is leaving after 17 years".
Explaining his vision for next term, the Portuguese said: "Moving forward I will organise my coaching staff in a way where the assistant manager figure doesn't exist".
With second place already secured and Watford also having nothing to play for with their Premier League status guaranteed, it was evident in the way the game started, as both sides displayed some level of lethargy that wasn't surprising seeing as nothing was riding on the game.
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"Martial is injured. He was injured on Friday, yesterday he couldn't train. He had treatment at the training ground", Mourinho said.
"I think they're different games really".
A classy operator ended with a classy sign-off patting the badge and offering a goodbye clap as a thank-you to the crowd, closing a gilded 12 years at Old Trafford.
Deep in his own half, he spotted Juan Mata's run on the right-hand side and pinged a ideal 45-yard ball into the Spaniard's path.
"But as I always say, even if you are not fighting for anything - because we are second even if we win or lose - we are playing to try to win a football match".