 FC Köln he set a record for the most goals scored by a player in a single Bundesliga match.On 17 August 1977, he tallied six goals (scoring in the 12th, 23rd, 32nd, 52nd, 73rd and in the 85th minute) in Köln's 7–2 victory over Werder Bremen in front of a crowd of 19,000 at Köln's Müngersdorfer Stadion.However, since television cameramen were on strike on that day, there are no known film of Müller's goals.