In that case, why would the players stay? Pirlo signed a new contract, most probably with expectations to challenge in CL and win serie A again. If we sell Vidal, should all of Pirlo, Buffon, Pogba and Tevez ask for a transfer?
It's selfish to leave the team in the middle of July, after signing a contract few months earlier, and even more, without a warning. He puts the team in an awful position.