Klaas-Jan Huntelaar is likely out of action for Schalke until January due to knee ligament damage, the club confirmed Thursday, though the Dutch international is seeking a second opinion.
Schalke coach Jens Keller and new star Kevin-Prince Boateng have both spoken positively ahead of their opening UEFA Champions League match against Steaua Bucharest, with Bayern Munich to follow in the German Bundesliga.
After tearing medial ligaments in his right knee during Schalke's Bundesliga match on Saturday, Klaas-Jan Huntelaar will miss at least four weeks leaving him out of the upcoming UEFA Champions League play-off against PAOK.
Shinji Okazaki made a goal-scoring debut for Mainz against his former side Stuttgart before Schalke and Hamburg shared the points in a thrilling 3-3 game in Gelsenkirchen.
Klaas Jan Huntelaar made an impressive return to the Schalke team with a hat-trick as his side thrashed Hamburg 4-1 to consolidate fourth place in the Bundesliga, while Frankfurt and Mainz played out a goalless draw.
Schalke striker Klaas Jan Huntelaar has said that he will "definitely" be at Schalke next season, although admitted it would be a "catastrophe" if the team failed to qualify for Europe.