Ivanovic has no problem comparing Ba with Didier Drogba.
He told the London Evening Standard: "Yes [Ba is similar to Drogba]. Demba shows every minute he's on the pitch that he tries to fight and is a physical striker.
"That helps us a lot, especially in this kind of game when you have to change something. Demba did very well against Southampton and his goal was a reward for the way he played.
"Sometimes you have to change your style of football and try to hit long balls, he's very useful for this team and very important. Everyone is happy about Demba scoring his first League goal but it's not just about that [scoring goals] because he can keep the ball and he did that against Southampton.
"It is a good thing and important for us to have different type of strikers and the manager can choose different ones for each game.
"We can change each match and also change quickly during the game.
"Demba has a lot of quality and is very important for this team. We can change our play because of that, especially in some games away from home when we are winning. He's a guy that can keep the ball up front. We will use him a lot in December and January."
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