Didier Drogba(Top) of Galatasaray heads the ball during an UEFA Champions League football match between Galatasaray and FC Schalke 04 at the Ali Samiyen stadium in Istanbul on February 20, 2013.(Xinhua/Ma Yan) 

Didier Drogba(R) of Galatasaray vies with Sead Kolasinac of FC Schalke 04 during an UEFA Champions League football match between Galatasaray and FC Schalke 04 at the Ali Samiyen stadium in Istanbul on February 20, 2013.(Xinhua/Ma Yan)

Players of FC Schalke 04 celebrate after scoring during an UEFA Champions League football match between Galatasaray and FC Schalke 04 at the Ali Samiyen stadium in Istanbul on February 20, 2013. (Xinhua/Ma Yan)

Didier Drogba(R) of Galatasaray vies with Sead Kolasinac of FC Schalke 04 during an UEFA Champions League football match between Galatasaray and FC Schalke 04 at the Ali Samiyen stadium in Istanbul on February 20, 2013.(Xinhua/Ma Yan)

Sabri Sarioglu(L) of Galatasaray vies with Bastos of FC Schalke 04 during an UEFA Champions League football match between Galatasaray and FC Schalke 04 at the Ali Samiyen stadium in Istanbul on February 20, 2013. (Xinhua/Ma Yan)

Didier Drogba(2nd R) of Galatasaray controls the ball during an UEFA Champions League football match between Galatasaray and FC Schalke 04 at the Ali Samiyen stadium in Istanbul on February 20, 2013. (Xinhua/Ma Yan)