I mean, theoretically, maybe. That sounds very tricky to enforce. My knowledge of contract law is all American, I can't speak for y'alls powdered wig-ass legal system.True but if the player or his rep is proven to have breached the NDA then it possibly voids the release clause, depending on how those parts of the contract are written.
One big question in all of this, I would assume player contracts are subject to some form of arbitration by the Premier League, FA, something other than a normal courtroom?