What Cristiano Ronaldo needs to do - Allegri

Cristiano Ronaldo's 98th-minute penalty for his former club Real Madrid saw the La Liga giants knock Juventus out of Europe in a controversial quarter-final tie back in April.

Previously, Ronaldo earned a standing ovation from his new support base after scoring an iconic overhead-kick in yet another triumph over Juventus for the 13-time European champions in Italy.

The Portuguese supremo has since signed for the Italian giant, and he took his tally to 11 goals in 18 matches with a spot-kick in the victory over Fiorentina. 

However, Allegri joked that for Ronaldo to be forgiven for hurting Italian outfit in the past, his new star player must now take, and make, all of his club's spot-kicks.

"Ronaldo takes the penalties," he said "After he's scored that one against us in the [98th] minute at 139km/h, am I supposed to let somebody else do that?

"He has to do something to be forgiven. He's got to take penalties and score... always."