During the 2009–10 season under the new coach Louis van Gaal, Lahm was able to play in his preferred position as a right back. After some difficulties in early games he played one of his best seasons ever, forming an excellent partnership on the right wing with Arjen Robben, scoring one goal and giving 12 assists in all of his games. Lahm was also chosen as vice-captain by Van Gaal, and played full-time in all of Bayern's competitive matches apart from the first-round game in the DFB-Pokal. Bayern went on to win the league and cup double and reached the 2010 UEFA Champions League Final, where Lahm played 90 minutes at right-back as they lost to Inter Milan 2–0.