Maybe I'm mistaking Kutuzov for someone else, but part of what Palazzi has to work with is that someone said that the player Colombo said: "I won't play, it will be a farce."
I thought those were Kutuzov's words, but I may be mistaken as to who said what. But that Palazzi is looking into this case right now, is what all reports are saying.
And by the way, Palazzi doesn't have to prove that Conte knew anything. It's sufficient for a ban in the sporting law that it's likely that he knew.