"The main thing for me is that he is working very, very hard," said the boss.
"The other day against Marseille he was trying to impress. He was going forward well and, okay, he made some mistakes in defence, but he also blocked some shots.
"He is working very hard but maybe he needs to be a little bit calmer and relaxed when he plays because he's a little bit anxious now.
"It's difficult because Italian football is very tactical. Everyone is together and they don't play too many long balls - it's less physical than English football.
"So, he will need time - but the main thing for me is that he wants to improve, that's clear.
"He needs to know the system here and he will improve. You never know how long it will take but hopefully he'll be better in the next game."