By all accounts that’s also why Gareth Bale managed to turn out for Real Madrid yesterday.
It won’t “show on the medical that there’s a problem”, because that’s not how medicine and medicals work. There isn’t a problem now, because he played thereafter. What has almost certainly happened is a difference of medical opinion; e.g. he has a trivially frayed meniscus which isn’t affecting him now, but Preston are sufficiently worried that it might need attention at some point within the contract they want to offer him. Fair enough; Preston’s right to pull out, and we agree about that. And we’re happy as he’ll be worth exponentially more down the track.
As above; he’s one of several saleable assets, and not necessarily our most saleable. And there isn’t “a problem” just because the Preston fans forum says there is, so there may or may not be something to rectify. He may or may not be near the end of his contract, because he may sign another.
I know you’re not being sanctimonious but I’m afraid “what you’ve found out” is pure speculation only.
And to prove WE’RE not being sanctimonious either, we’re prepared to offer you arguably a superior player, Jon Obika, for the same knock-down price of £1m.