Real won a thriller 2-1, with Vinicius Junior hitting a stunning late winner.
Ancelotti said, "We were up against a very strong side who demonstrated all their quality, especially in the first half. They went ahead early on from a corner and then we found it harder to press high up the pitch, we got a bit unbalanced and allowed them a few chances.
"After we equalised, we defended better, controlling the game better and we were lucky enough to get the goal. In all honesty, I think a draw was the fairest result and at the same time I think that Real Madrid didn't deserve to lose.
"Vinicius has scored an outstanding goal, that of a player who has something special in his boot and in his physique. Vini Jr. has surprised me with his goalscoring quality. This has surprised me. I knew about his individual quality,
"I knew how good at dribbling he was, how strong in one on ones, but what is surprising everyone is his ability to score goals that he didn't have in the past. He hasn't had the game that everyone expected, he focused on the game and he scored an outstanding goal, a fantastic goal. An unbelievable strike."
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