The United manager is losing his right-hand man of the past 17 years after the FA Cup final against Chelsea on Saturday because he wants to become a manager.
Veteran midfielder Carrick, 36, is hanging up his boots to take up a place on Mourinho's backroom employees - though that transfer was deliberate earlier than information of Faria's departure was introduced on the weekend.
"He [Jose Mourinho] has mentioned mentality a lot in the last few weeks and I am convinced it's because of those peaks and troughs coming so unexpectedly".
It is clear, though, that the seat is being kept warm for the five-time title victor.
'I think it will be Michael Carrick in the future.
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"And when Michael (Carrick) has the pro licence badges".
'The end-game, maybe, if I get into it and I think I'd like to manage - probably at this stage my answer would be yes (I would like to be a manager) but I'm not getting carried away.
"I'm going to have assistant coaches, I'm going to have fitness coaches, and a structure where they have specialists in different areas connected to the performance".
As Jose Mourinho sprinted down the Old Trafford touchline to celebrate Porto's stoppage time victor over Manchester United, knocking the Premier League giants out of the Champions League, Rui Faria held the fort on the bench. I look forward to working with him and learning from him.
The 55-year-old Englishman was asked by Premier League Daily whether or not Jose will miss an assistant like Faria, to which Phelan replied, "That's a good question".
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"It was an unbelievable reception when I came off", Carrick said of Sunday's match. It's an fantastic place to play football. Merci for all you [taught] me, on and off the pitch.
Silverware, domestic and continental, has eluded them and the FA Cup is the last chance of ending the 2017-18 campaign on a high.
'It changes overnight, ' Carrick said.
Mourinho revealed a knee injury had kept him out. Unused subs: J Pereira, Jones, Valencia, Lingard.
MAN UTD: Romero, Bailly, Rojo, Blind (Herrera 76), Darmian, Carrick (Pogba, 84 mins), Mata, Young (Shaw, 60 mins), McTominay, Rashford, Sanchez.
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