"He showed all his quality today," the Italian is quoted as saying by Chelsea's official website. "He was outstanding and combined well with his teammates.
"He was a threat and exactly what we were looking for. He has great technical ability, a turn of pace.
"He can play with his back to goal and has a lot of characteristics he can bring to our team."
Chelsea are back in the Premier League action on Wednesday when they host Reading at Stamford Bridge.