Thank you very much for what you suggest.
Of course, raising the case of Mr. Huseyin Celil, and not just raising it but demanding that the Chinese government release him immediately and unconditionally, is critical; otherwise the Chinese government can do anything in its prison and may even just torture him to death. It's going to be really terrible if he's tortured or just dies in prison.
Mr. Huseyin Celil is a Canadian citizen, so the Canadian government should absolutely demand his immediate and unconditional release from Chinese custody.