Celts will do exactly what they did last year and that is wait out the market and let it determine Quis' value. It's likely he's a vet. mini, and not a biannual candidate due his health issues ... past and present.
With that in mind, and D. West likely being resigned, it's hard to imagine they would take a chance on Quis unless the cupboard is totally empty. That ship has probably sailed. They may be able to find a more durable wing (like Sasha) in the market.