Chelsea warmed-up for Saturday's Wembley showdown with Manchester United by a crushing 3-0 final-day defeat on Tyneside.
The 36-year-old did have other options as he approached the end of his playing career but the chance to work under Mourinho was too good to refuse.
He is now focused on his role as a first-team coach, starting with this weekend's match against Chelsea. 'I am not training this week.
"I'm there to give my opinion". He also won 34 England caps. "But it is a hard role, you need somebody to talk to because you can't bounce things off people if they're not there". It was the final chance to cut the cloth clean.
'Because I've got things, I'm kind of more excited about the future than looking back and being sad that it's over'.
Jose Mourinho led Manchester United to glory in the Europa League and the League Cup.More news: Nokia X6: What we know so far
When asked how much Mourinho will miss having a No 2, Phelan, said:"That's a good question".
Becoming a manager himself is something Carrick might want to pursue one day but that is not something he intends to push for yet.
"He's been around for many years". I don't know. It is the manager's decision. "We just want to get it right this time".
'It is minimize clear and I can transfer on and focus exclusively on the opposite facet. It's not an issue.
"I got to Michael in the last part of his career and it was enough to fall in love with the player and person".
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"From that moment, not just United supporters but the players knew that City were way ahead of them".
"And when Michael (Carrick) has the pro licence badges".
'However simply because I used to be a half-decent participant, it would not assure you are going to be a hit in no matter you do. "I'm well aware of that", he said.
Despite securing a runner-up finish in the Premier League and making their way through to the FA Cup final, the Red Devils have once again faced accusations of flopping in 2017-18.
The club will reportedly announce their agreement with Juventus and Sandro after the FA Cup final on Saturday.
"There's not a game where you think, "It could have gone either way", I think we've deserved to win the games". "I think it was when Ash [Young] went off, I thought it was going to be then".More news: European Union data protection may trigger global ripple effect