In 1982, Galler took charge of the first leg of the "Supercup" match of Barcelona vs. Aston Villa (1–0). On 1 November 1983, he was suspended for three months by the Swiss Football Association when he didn't abandon a match in first Swiss League (Kuesnacht vs Duebendorf, 17 September 1983).[citation needed][clarification needed] On 27 September 1989, when refereed the UEFA-Cup match between Ajax and Austria Vienna, he abandoned the match in the 104th minute (score 1–1) after an iron bar was thrown at Vienna's goalkeeper, Franz Wohlfahrt. Galler also refereed a German Bundesliga match between Borussia Dortmund and Waldhof Mannheim (2–0) on 30 March 1990.
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