AC Milan midfielder Massimo Ambrosini regards Wayne Rooney among the world's best ahead of their clash at Manchester United.

Rooney's profile has shot up over the last few months, with both Fabio Capello and Sir Alex Ferguson declaring the 24-year-old to be among the best players in the world.

"Rooney is considered to be a star player on the world stage," said the Italy international.

"He is better than in the past. He has improved and is now a complete player. He is one of the best in the world at the moment."

Ambrosini's words were echoed by coach Leonardo, who must try to find a way of stopping United's talisman, whilst retaining enough attacking invention in his own side to help them become the first team to beat the Red Devils in a two-legged game after losing the opener on home soil.

"Rooney is a fixed point of reference in the United team," said the Brazilian. "It is incredible to see the way he has developed, grown and matured as a player.

"Maybe it has had something to do with Cristiano Ronaldo leaving because it meant he needed to step up."