Chelsea boss Mauricio Pochettino was delighted with Cole Palmer's performance for their FA Cup win against Preston.
Palmer's assist marked his 15th goal involvement in 20 appearances this season.
Pochettino said: "Very impressed. I think he arrived the last day of the transfer window and his performance after six months, was incredible. We are so happy.
"Today a little bit disappointed with him because he didn't score a big chance he has. He is still young and still needs to improve in different areas, not only inside the pitch but outside.
"He needs to understand many things but I think he is improving a lot and he is a very good player for us and he is doing fantastic and I am so pleased."