The France international admitted he was guilty of a lack of focus during his sides shock defeat at Brighton last weekend and claimed he would be fined were he to reveal all about his relationship with Mourinho following Uniteds opening weekend win over Leicester City.
Mourinho invited Untieds stand-in captain to clarify his recent comments ahead of Mondays clash wit Tottenham at Old Trafford, but Rooney, who played alongside Pogba during his two spells at the club, insists his former teammate must concentrate solely on his performances on the pitch.
Paul Pogba on Brighton defeat
My attitude was not right. It has to be a big lesson for us. They had more hunger than us. I put myself first, that my attitude wasnt right enough. We made mistakes we shouldnt make.
We tried to push and push, we kept trying, but it was a bit too late.
He is a fantastic player but he has to do it for himself, he told CNN World Sport.
If theyre going to win the title, hell be the main player in terms of them doing that.
You hear a lot of people saying Jose Mourinho needs to get the best out of him but he needs to do it for himself and prove hes at that level to help Man United.
More: Manchester United FC