Description:Istanbul club Galatasaray have agreed with Shanghai Shenhua to sign striker Didier Drogba, the club said in a statement to the Istanbul Stock Exchange on Monday (January 28). The deal is for 18 months starting in the second half of the current season, Galatasaray Sportif, the Istanbul's club merchandising unit, said. "The opportunity to play for this great club was an offer that I could not turn down," Drogba was quoted as saying on Twitter.(0:33)