The 60-year-old Italian, who is heavily favoured to take over from Antonio Conte at Stamford Bridge, was unable to win any trophies with Gli Azzurri
"I think Sarri needs to make that last step to be a champion and a top coach. He is a great coach but he is not a world class-coach because he hasn't won anything – that means he isn't at the top.
"I like to see a good style of football but in the end, if you don't win but play good football, it doesn't mean a lot. Juventus don't play good but win all the time. I knew when Conte was going to Chelsea. I was sure that Conte is a winner and, in fact, he has won two titles and proved it already: the league and FA Cup."