The worlds most expensive player had to watch from the bench after pulling up with a hamstring problem in the warm-up as his side went on to beat Getafe 4-1 at the Santiago Bernabeu.
A brace from Cristiano Ronaldo and goals from Pepe and Isco saw Los Blancos come from behind and move two points behind Barcelona and Athletico Madrid at the summit of La Liga.
The Italian manager admits he does not know how serious the injury is but having spoken to club doctors it does not seem a serious problem.
“He had a small problem in the warm-up. Having spoken to the doctors, I don’t think it’s a serious problem,” said Ancelotti.
“The player felt discomfort and we didn't want any problems. He’s not happy right now because he was very excited about playing at the Bernabéu.
“I don’t know how long he’ll be out for, we’ll see what happens on Monday. I think he’ll be back for the game [against Atlético Madrid] on Saturday.
The pre-season he had was unusual, not only in physical terms but also mentally. We’re training to improve his physical condition.”
The form of Karim Benzema has proved to be a worry for Ancelotti with the home fans chanting for Alvaro Morata to take his place.
“I think he did a good job. He had a lot of chances to score; the crowd’s reaction was good, because they applauded him,” said the Real Madrid boss.
"I don’t think Benzema felt pressure from the crowd: even if he doesn’t talk a lot, he’s a player with character. Applause and whistles are both good ways of motivating a player.
"By talking about Morata, that puts pressure on Morata. I think they are normal things on the field.
“We have a clear idea of how we want to play. We have to improve our combination play, and we need more variety.”
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