Muller's function at Bayern is different. He was a winger early in his career, but he is now firmly entrenched in a center spot just off primary striker Robert Lewandowski. They are almost like two parts of one player - Muller will drop back and help out defensively, while also being willing to run with the ball at times. As a winger, Thomas Muller played extremely fast football, using his speed to dribble past defenders and open up space for teammates. This is exactly what makes him such an important part of Bayern's system today, as he can play anywhere across the front line. He often starts games on the left side, but if Jerome Boateng is sent off or is replaced, he could move over to the right side instead. Their relationship goes beyond football too. Muller has said that his friend status with Lewandowski means more to him than any trophy or award. They enjoy training together and having fun with each other outside of work too - they both have daughters who share the same birthday, and Muller even calls Lewandowski "onkel" (uncle) because they share the same age. In short, yes, Thomas Muller is a winger, but he is also very much a central midfielder at heart.