"I am just dying to play and have the chance to get that top on for the first time," he said.
"There are some big games coming up but my goal is to be there on the opening day of the season."
He also talked at the difficulties of getting Bayern to allow him to leave.
"Maybe if I had been a local boy, things might have been different," he said.
"But I had spent 10 years in Munich. I had won everything it was possible to win and felt it was time for a new challenge.
"I know Bayern were in a difficult situation but in the end, I felt it was best for all parties that I left."
He makes playing for United sound quite easy.
"The manager has so many options," he said.
"Every player is very different and very unique. You look at people like Wayne Rooney, Cristiano Ronaldo, Paul Scholes and Ryan Giggs - they are some of the best players in the world.
"All I can do is get the ball, then give it to one of them to do their thing."
"Not every player is going to play in every game," he said. "That is a fact.
"The important thing for all of us is that Manchester United needs to be successful.
"If we all miss a few games but end up with a couple of cups in our hands, I am sure everyone would be very happy indeed."