He was suspended from football for six months in 1998 after doping testing returned a positive result for the banned substance Phenylpropanolamine.

[citation needed] In 1998, Şaş signed with Galatasaray for $4.4 million,[3] but almost immediately upon arrival, he was suspended from football for six months after doping testing returned a positive result for the banned substance Phenylpropanolamine.

[citation needed] In the Champions League competition in 2000–01, Şaş made 12 appearances for Galatasaray.

He scored against Spain's Real Madrid and Italy's A.C. Milan as well as against the Brazil national team in 2002 FIFA World Cup.

[citation needed] At the end of the 2008–09 Super Lig season it was announced that Galatasaray would not be renewing his contract and after declining many contracts to play in Qatar and Saudi Arabia, Şaş announced his retirement from professional football.