Rooney is challenging Messi as the world's best this season.
"Manchester United have a player who can now be considered as world class as Rooney has been fantastic this season," the Argentina superstar told ESPN Soccernet.
"He has become the striker who can do it all. He leads the line, he moves wide, comes deep, his heading ability seems to have improved so much and he is so strong when he plays with his back to goal. Rooney's energy is amazing also and I give him all the credit for becoming a world class player."