Mbappe is yet to break his duck for Real after their opening two games of the season.
But Ancelotti says: "He is progressing very well. He is very humble and I think he is adapting very well.
"He hasn't scored in two weeks, so we shouldn't worry. He wants to score in the next game, just like Vinicius."
On facing Las Palmas tomorrow night, Ancelotti continued: "We expect an intense match despite the heat. They like to play and I think it will be like this.
"It is changing. Last year we took them out in the last few minutes. It is normal that it happens every year.
"We have to talk about something more general. You have to have a compact team and for that the work of the forwards and the defenders is important. If the striker presses and the defence does not come out, there is no compact team. Just as if the attackers do not run back."