Seeing the Coutinho saga from an objective point of view and how they have no chance in hell in keeping him or repairing the relationship, I can understand the 'players will' approach Beppe is talking about.
Forcing your players to stay is not a viable strategy. Just look at Liverpool again for example, they have $#@!ed it all up with Coutinho, guys like Can won't sign a new contract unless they have a release clause and nobody is happy.
What I don't like from Beppe though is that I feel sometimes that he's daring the players to leave.
I think this is relative.
I'm pretty sure Matuidi did everything he could to leave last season, he publicly admitted it. The sheik didn't allow. What happened? He played decently for a year for them.
It depends a lot on player's profile I guess. If you do that to a Tevez, he will fuck you up.
Anyway, if selling is inevitable, at least sell for the market price, not below it.
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Btw, I think he exaggerates even his operandi modus. Alex Sandro for example - I'm dead sure he tried and managed to convince the guy and his agent to stay. How? More than doubling his wages.