sentences:  It seemed to be impossible for him to play professional ice hockey any longer but Müller recovered and had his comeback on February 3, 2007, at the DEL All-Star Game 2007.In 2008, he was reappointed to the national team at the Skoda Cup in Switzerland.In August of that same year, while playing for the Kölner Haie, the tumor continued to grow, requiring another operation.