Mourinho has been impressed by the promoted side but has not spoken to Mendes, whose influence is prominent at the Black Country club.
United host Wolves on Saturday with the chance to win four games in a row for the first time since January, and Mourinho said he is confident his team have improved from last season. I don't change that because we won two matches in the Premier League. 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. Asked whether this was down to the Lindelöf-Smalling partnership, Mourinho said: "No, I think the team as a team is resolving the defensive problems better than before".
"I'm a bit like I'd imagine Mourinho is, where you see someone who's got so much talent, but not making the most of it". All of them, they can say the same thing.
"I think the happiness, the confidence, the self-esteem was what pushed him to play the first match nearly without training against Leicester and played a very good match".
The right-back's debut was delayed while he recovered from knee surgery but he looked assured as he made his first appearance for the club on Wednesday in a 3-0 Champions League victory over Swiss club Young Boys.
United go into the Wolves game on a run of three straight victories, conceding only one goal in the process.
Mourinho refused to single out the 29-year-old but, in answer to a question specifically about Sanchez, challenged his entire squad to get better.
It seemed to me that the City players were waiting for his instructions, they needed a kick up the backside to go and take the next step in the game. "Maybe the young United full backs can emulate the two terrific full backs from Liverpool - Robertson and Alexander-Arnold".
The Argentina global is yet to feature this season for Mourinho and the plan was for him to play the full 90 minutes in a Premier League 2 clash with Reading. Good results bring confidence. "He's a very good player".
"It's more about the moment and the momentum is very important in the positive and negative way".