Ivorian's condition is better now, says boss
The Ivorian has suffered from malaria and had a difficult time on the pitch as loss of form saw him being benched against Tottenham.
The 32-year-old did come on during the game and score to level the terms, but managed to miss a crucial penalty that could have given his side all three points. This would have put an end to the then four-match winless streak, but it was not to be.
However, Ancelotti believes that the former Marseille man will return to his peak when his side take on the Gunners at the Emirates.
"I understand he has not been in a good condition," Ancelotti told reporters. "He had difficulty to play with malaria, he was tired, he was not 100 per cent and he found it difficult to train.
"I put him in the last few games even though he was not 100 per cent because we need to have his character and his personality.
"But now his condition is better. He had a good reaction after coming on as substitute in the last game.
"Following the goal against Tottenham, he will show us a different Drogba in the next game."
Chelsea lock horns with Arsenal on December 27.