The Germany international joined Bayern from Schalke in the summer of 2011 and believes he made the right choice to make the switch to the Bundesliga champions.
However, he has admitted he could be on the move in the future if he ever feels that he needs a new challenge.
"Winning the treble was confirmation for me that joining Bayern rather than moving abroad was the right decision," the shot-stopper told Bild.
He added, "I am not thinking about a possible future after Bayern at the moment. I have never experienced a team where the players have such a high level of respect toward each other and I am very happy to be part of this team.
"But I obviously don't know what will happen in the future. Things can go pretty quick in football. I can all of a sudden reach the moment where I need a new challenge ..."
The 27-year-old has a contract with Bayern until the summer of 2016.