As much as it would be wise to keep him around - I think he’s been excellent when selected - I would assume any loan agreement can be terminated by parent club, if a sale can be agreed with another club.
He was diagnosed with Atrial Fibrillation after collapsing in the play off final. He had an op (not sure of the details but it generally what they call an ablation). Recovery is usually successful. But it can come back and I wouldn’t be surprised if it’s a relapse. It may mean the end of his career. Whatever happens I hope he can make a full recovery.
Of course they will get money back at some point. Who knows if ticket prices get pumped, hope not but these are business people. I suppose if we are serious about competing then further funds are needed.