When did Bayern Munich win their first competitive game under Barcelona's former manager?
2009–10 FC Bayern Munich season The 2009–10 season of Bayern Munich began on 1 July with their first training session, led by the team's new head coach Louis van Gaal. After several friendlies the first competitive game was a cup game on 1 August. The league started on 8 August.
1987–88 Bundesliga The 1987–88 Bundesliga was the 25th season of the Bundesliga, the premier football league in West Germany. It began on 31 July 1987 and ended on 21 May 1988. FC Bayern Munich were the defending champions.