Drogba scored in yesterday's victory at Middlesbrough and Grant said: "I have seen Didier in the last month in training, in my room, on the pitch and I haven't had one problem.
"If he has done something off the pitch and he regrets it, it's good.
"He is not a negative person. If he was negative on the pitch or in the dressing room or when he spoke to me, that is another story.
"But it's not like this. Players need to speak on the pitch, and he did that very well.
"I can tell you I have heard what the player said to me and how he has behaved on the pitch and off the pitch.
"When he speaks to me, he is very positive and when he is on the pitch, he is very positive. He is not a negative guy, and that is what's important."