Though he signed in the summer transfer window, he has been out of action since but finally got off to the flawless start during Man United's comfortable 3-0 dispatching of Swiss champions Young Boys.
Despite that strong display, Mourinho said he would leave the teenager out of his line-up to face Wolves in the Premier League on Saturday, instead selecting him for Tuesday's League Cup third-round home tie against Championship side Derby.
City missed Guardiola's presence on the sideline this week, and for all the talk in the early part of the season that Mourinho was a distraction and a problem, whatever he has said, he has that team behind him now. We are going to play better than we did but I think it's going to be a very hard season. He is a player to be here to compete for positions (in the team). A team that yesterday looked very bad, today looks very good and yesterday looked very good today looks very bad.
Mourinho has fielded a central defensive partnership of Chris Smalling and Victor Lindelof in each of those three wins, having started the season with Eric Bailly playing alongside the Sweden worldwide.
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He was also full of praise for manager Nuno, saying: "I think he is a great coach". He's not going to stop me, he lets you play, and that's one of the criticisms.
"It's a good team - fantastic players, fantastic manager". The spirit, the cooperation, the empathy and communication have all improved in the team.
The closeness of Mendes' involvement at Molineux prompted the English Football League to investigate the set-up last season, although it was found to comply with the body's rules. He's my agent and that's it.
And a lot of the admiration for that has to go to the manager, for getting the mentality right, and to the players for accepting that it can't always be the manager's fault, it's easy to hide behind other people and, with someone as big as Mourinho, players can try to hide behind him, let him take the flak, so it's good that they chose to step up.