Galatasaray are set to lose their biggest attacking threat for a significant period after Victor Osimhen suffered a knee injury that requires surgery.The Nigerian striker played the full 90 minutes in Wednesday's Champions League victory over Stuttgart, but subsequent medical examinations revealed a problem requiring arthroscopic surgery to remove a fragment of tissue from his knee joint. The Turkish champions confirmed that the procedure is scheduled for Saturday.Osimhen faces tax problems, as his lookalike slams GalatasarayGalatasaray have yet to provide a recovery timeline, although injuries of this nature can typically require four to eight weeks of rehabilitation. Osimhen could therefore miss the Istanbul derby against Besiktas on November 30, as well as Champions League encounters with Aston Villa and AEK Athens.The 27-year-old has been in outstanding form this season, scoring 10 goals in 11 appearances across all competitions. Nine have come in eight Super Lig outings, while his only Champions League goal so far arrived in the victory over Lille.15.30: (2.65) Leeds (3.50) Tottenham (2.60)His absence would represent a significant setback for Galatasaray at a crucial stage of their campaign.