What Dutch football manager was previously a key player for FC Bayern Munich in 2004-05 to win the German double for their second time in three seasons?
2004–05 FC Bayern Munich season: FC Bayern Munich won the German double for the second time in three seasons, ensuring the first season for Felix Magath as manager was a successful one. 2004–05 FC Bayern Munich season:  Among the key players in the success were Roy Makaay and playmaker Michael Ballack. Roy Makaay: Rudolphus Antonius "Roy" Makaay (born 9 March 1975) is a Dutch football manager and former footballer who played as a centre-forward.
Roy Makaay