Leverkusen's talisman started Saturday's fixture from the bench, possibly with the idea of keeping him fresh for Tuesday's Champions League tie. However, a seventh minute goal by Rolando Schmid forced Xabi Alonso's hand, and Wirtz was introduced at half-time. A tackle by Mitchell Weiser early in the second half appeared to cause an injury to the 21-year-old's lower leg, sparking fears he could miss the second leg of the last-16 tie against Bayern.