If we were to arrange a deal with Valencia for them to take Denayer on loan for 1 or 2 seasons, with the condition that if he's fit, he play, then we should bite their hands off.
As much as I'd love him to stay and fight, lets be realistic, a centre half rarely plays week in-week out for a top top club until they're 23/24. The next two seasons are all about development for JD, and as we've seen in the first two games, he's not getting in ahead of VK or EM any time soon, and I wouldn't be surprised if MDM is still ahead of him in the pecking order.
We have him tied down for 5 years, so bring him back in a couple of seasons when he is old enough, good enough, confident and experienced enough to really steak a claim.
If he stays, I'll still have massive hopes for him, but barre some serious injuries I can't see him getting many games at all - and that's even without Otamendi signing.