The former Cruzeiro star started in victory over Levante.
"He had a great first half, like the rest of the team," said Ancelotti.
"He played with speed. He was more at ease in the second half and played the ball sideways more frequently. I'm certain he will be a good player for the future. He will improve because he has only just arrived, he's young and he has to get used to things here. He is a serious professional with plenty of quality."