Dortmund full-back Dede will undergo knee surgery on Monday, after he damaged the anterior cruciate ligament in Saturday's 3-2 win at Leverkusen. The Bundesliga side confirmed that Dede's scan proved an ACL injury, which will rule the Brazilian defender out for at least six months. Dede, 30, felt pain to his left knee in the 65th minute of the game at BayArena, but the injury was actually sustained seven minutes later. Meanwhile, Dortmund announced that Egypt forward Mohamed Zidan has penned a four-year-deal with the club, following his move from Hamburg.