In the 2004–05 season, Wolf remained in the first team at the start of the season until he suffered a muscle injury that kept him out for two months. After making his return from injury in a 3–1 loss against Bochum on 27 November 2004, he was sent off for a second bookable offence in the next game on 3 December 2004, a 2–2 draw against Bayern Munich. As the 2004–05 season progressed, Wolf suffered a shoulder injury that kept him out for the rest of the season. He finished the 2004–05 season making 18 appearances in all competitions.