Pereira is with United for their preseason tour of the US after spending last term on-loan with Granada.
Asked about his situation, the Brazil U23 international said: "I'm focused on United today.
"I'm here, I want to stay here and I think I'll stay here. (Jose) Mourinho knows how to deal with players, how to do things and manage the team.
"He always gets results and trophies. I watched all the matches of United last season and I was very happy."