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.
2008–09 FC Barcelona season In 2008–09, Futbol Club Barcelona started a new era with a new manager, former player and Barcelona Atlètic coach Pep Guardiola, who led the team to the first treble in Spanish football history. After selling off high-profiled players such as Deco and Ronaldinho, Barcelona played scintillating football throughout the season, winning the Copa del Rey, La Liga and the UEFA Champions League. This Barcelona squad is considered as one of the best in history.