Leao produced two assists on the night.
Pioli reflected: "I spoke quite clearly to Rafa this week. I told him what I expect from him and I am very happy with his performance.
“He's a very young and strong boy. [Alexis] Saelemaekers is growing so much as well, we also have [Samu] Castillejo and [Ante] Rebic who has been out for a month. [Jens Petter] Hauge was doing well too. We raised the level of the attacking department."