Fabio Quagliarella has warned Napoli's players ahead of a first preseason under coach Antonio Conte.
The striker played for Conte at Juve.
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He said, "With Mister Conte the training sessions are terrible (laughs). I saw people vomit, but the results in the end they are excellent."
Quagliarella then also spoke about Ciro Immobile and his uncertain future at Lazio: "In my opinion, Ciro wants to redeem himself at Lazio.
"When you reach a certain age, you almost become a nuisance and no one knows why. Treating a player like Immobile like that is not the best. He still has fire inside him, he still wants to prove his worth, but he is disrespected after everything he has done at Lazio."