If we're playing three at the back next year it seems like Chambers will fall between depth and a starter.
Monreal / ??? ---- Papi / Kos ---- Mustafi / ????
I'd assume Holding can step in for Monreal once he's fit, where as Chambers could either replace Mustafi or be the backup there. Ideally we ship Mustafi, sign someone and then let Chambers play across the back line (as needed) until Holding comes good.
If we're playing a back four with proper fullbacks, then I think we should keep Chambers until Holding comes back/Christmas.
Kola/Monreal --- Papi (Chambers) --- Kos (new signing/Chambers) --- Bellerin/AMN
Plenty of need for Chambers with Holding hurt and Mustafi shipped.