Chelsea boss Ancelotti: We can cope without Drogba
Drogba had already made and scored one of Chelsea's goals before he had to be substituted.
Drogba has now scored five goals and was unplayable against Spurs and while the Italian is hoping the injury is nothing more than cramp, he believes they have enough in reserve to cope without him.
"We don't know precisely what happened," said Ancelotti. "It is too early. We will have to wait a few days. We hope it is only cramp.
"We hope tomorrow we will have a precise diagnosis of the situation. It is a calf injury but he felt that he had cramp. If it is cramp, it is good for us.
"We have played without Didier before. He is a very important player for us, a fantastic player. I think we can play well without Didier."