Former Juventus striker Nicola Amoruso has taken a swipe at Cristiano Ronaldo.

Amoruso has questioned Ronaldo's form this season and feels age is catching up on the 34 year-old striker.

"For a few months, Cristiano is crawling on the field," he said.

"He should be humble and recognise that he is old and it is more important to rest than play.

"It is difficult to manage but I am convinced that he can still make a difference."