Antonio Casino has claimed that all is not well between Juventus manager Maurizio Sarri and Cristiano Ronaldo.
The former AS Roma and Real Madrid forward is of the opinion that there is a 'big problem' between the manager and the superstar.
Sarri withdrew Ronaldo on two occasions when Juventus is in need of a winning goal, which led to suggestions that the relationship between the pair is not cordial.
Ronaldo scored from the spot-kick to rescue a point for Juventus against Sassuolo in their 2-2 draw in the Series A.
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Cassano is convinced there are issues among the squad.
'I think Ronaldo has a big problem with Sarri,' Cassano told Tiki Taka.
'Everything started with two consecutive substitutions, which will irritate any player.
'In my opinion, there's a problem between them and Juventus are good at keeping it down.'