Che made two Bundesliga appearances as a substitute for Hoffenheim last season, but just one substitute appearance in the German Cup. He also played 24 times for Hoffenheim's reserve team.
Hoffenheim also said Eduardo Quaresma was returning to Sporting Lisbon after he made just four league appearances for the team this season.
"Justin and Eduardo are talented guys with great character who have both repeatedly shown promise," Hoffenheim sporting director Alexander Rosen said. "However, we agree with the players that they need regular playing time at this stage of their careers to develop continuously. We can't guarantee them that with us."