Striker Brekel Embollo will lose the game for six weeks because of a broken leg, said the Swiss Football Association.
The German Schalken 04 roof is a fracture of the metatarsal left foot, acquired a few days ago.
21-year-old Embleo will not be able to participate in the Belgian league game against Sunday.
On Thursday, the Crusaders take the Lugar Qatar team. The injury will allow Embollo to participate in the last two Champions League clashes against Porto and Lokomotiv Moscow teams.