Ancelotti made his final two substitutions at half-time before Drogba pulled up with an apparent groin problem just before the restart.
"Didier never said anything at the end of the first half," the Italian said.
"He had a problem but after five minutes he was good to play to the end of the match without a problem. Now he doesn't have a problem."
"We are disappointed because we have lost John Terry for the next game but I don't have to say anything about the decision," he said.
"Everyone is under pressure at this moment. He is the captain and involved in this exciting race."