Didier Drogba has warned Chelsea all their good work against Valencia could be undone by Schalke on Wednesday night.

Drogba, who issued a statement reaffirming his commitment to Chelsea in the wake of the quit threat he issued in a French magazine interview, scored the winner against Valencia in the Mestalla in their last Champions League outing.

"We´ve had a difficult start so we tried to win away." said Drogba. "We did it and now we have to focus on Schalke and it will be difficult because they have won against Rosenborg away and these two games are important to qualify as well as the next game. "

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