- Gerhardt joins Wolfsburg on five-year deal.
- Came through the Köln youth ranks, before making senior debut in July 2013.
- "Would like to make next step in career."
The 22-year-old has put pen to paper on a five-year deal through to 30 June 2021 and becomes the Wolves' third acquisition of the close season after Daniel Didavi and Josip Brekalo.
"I'm really grateful to the coaching team, those in charge of FC and my teammates for putting their faith in me and giving me the opportunity to become a professional at my hometown club and develop into a Bundesliga player," Gerhardt said. "1. FC Köln and their fans will always be very dear to me. I leave FC with a heavy heart, but with the move to Wolfsburg I'd like to make the next step in my career and I'm grateful for FC for allowing me to do so."
Gerhardt turned out 77 times for the Köln first team after being handed his professional debut by current Billy Goats head coach Peter Stöger in July 2013. The six-time Germany Under-21 international made 29 Bundesliga appearances in 2015/16, registering two goals and four assists as ninth-placed Köln enjoyed their highest league finish in 24 years.