Real meet Borussia Dortmund on Saturday as LaLiga champions, though were hit by injuries at the start of the season.
Ancelotti said: "When Courtois got injured we had Andrey and we signed Kepa. It was a very good signing because, despite not having played a lot, he has brought a lot to the dressing room.
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"When Milito got injured we thought we had Alaba, Rdiger and Nacho. When Alaba got injured we could have had a problem. Nobody believed that we had a problem and this was very important. The players seized their chance.
"I want to thank Tchouameni for his work because he played as a centre-back, which he doesn't really like. He preferred to play rather than stay on the bench, as did Camavinga, who played at left-back and he didn't like that either. My players have adapted a lot."