But he had no doubts about returning to the club he joined as a teenager, saying: "I came back because I wanted to and United showed that they wanted me back.
"We have a good team who wants to win they league again with a big manager, top players and a new team.
"My ambition is always to be No.1, always be the best.
"To be the best is to win the league - that is the objective of everyone. That's what we want to do.
"We want to go back to the Champions League because I know that's where we belong."