"We knew it was going to be difficult and always will be, as that is the situation in Italy," he said of the 1-0 result.
"Chievo are very organised and were tough to beat, but at the end of the day we took home three very important points."
The Brazilian has made in total only three appearances for the club since completing his £20m move from Werder Bremen, as he has struggled with muscular problems.
"I am in good shape. There is still a way to go before I can be on top form, but I already feel ready to face any opponent."