The Italian said that he was shocked by the "easiness" of the match, considering that his team played much of it with 10 men.
"After being left 10 players on the pitch, I didn't expect a game of that easiness," Ancelotti told Spor Smart. "We made some changes in our system. My team reacted well in the second half and that's how we won it.
"Juve are one step ahead of Galatasaray, because a draw will be enough for them, but Galatasaray have very passionate supporters. They can win this game. It will be a perfect match."
The result fired Real through to the knockout stage of the competition.