Bayern Munich full-back Christian Lell could face several weeks on the sidelines after sustaining a thigh injury in Saturday's 1-0 defeat at Hannover. Lell was forced to leave the pitch after only 14 minutes as the Bundesliga champions suffered their second successive defeat. Initial diagnosis suggested that the international full-back tore a right thigh muscle, which means that he could be out for up to three weeks. Lell is likely to miss Tuesday's Champions League clash with Lyon as Marcel Janssen could be called into action.