The Portugal international has battled for consistency under recently-appointed coach Sergio Conceicao. But Ronaldinho remains a fan of the player.
“There are great players at Milan and it is a good team, so I think they can do great things next season,” the Brazilian told Sky Sport Italia.
He added: “Leao does not need my advice, he is a great player. He is one of the players I most enjoy watching.”
Leao has 10 goals and nine assists for the Rossonero this season.