Mancini was speaking after victory over Atalanta.
“He is a very young player and he struggled at first because he was unaccustomed to the heavy workload in pre-season training that we do in Italy. He was therefore a little heavy for a while, but over the last few days he's getting stronger.
“I don't want too much pressure put on him, as he too needs time to adapt. I am happy with the defence, which went very well despite the fact we've only had three games together.
“I thought the Man of the Match was Marcelo Brozovic. It's positive that we started alright and got better as the game went on, which is a good sign for the fitness levels."