Chelsea boss Avram Grant believes Didier Drogba's scoring drought is down to the conditions he experienced while playing for the Ivory Coast in the African Nations Cup.

"In Africa, it was not easy," said Grant. "I think all the players, except Salomon Kalou, from all the clubs, didn't come back the same because they played in 40-degree heat, a lot of humidity; they didn't train and the pitches weren't so good. But all of them are now better, including Didier."