Career
In January 1981, prior to a national team tour of South America, Müller and Dresden teammates Peter Kotte and Gerd Weber were arrested at Berlin-Schönefeld Airport by the Stasi for plotting to escape to the west. Weber was given a prison sentence, but Kotte and Müller were released, but banned from playing at the top level of East German football. Müller played out the rest of the 1980s with a succession of lower league clubs.
After reunification he had a brief stint with Tennis Borussia Berlin, before retiring.
He now works as a coach.