They may not have a choice. MGW is contracted to June 2028, so 2 years left. If he doesn't extend further, then they'll only see his value drop significantly.
I feel that the fact he only extended for 1 year is indicative of him wanting out, and he only signed that extension under threat of legal action from the chubby Bubble. He's also missed out on a WC call up which, after his last season with Forest, MUST be making him think that his international aspirations would be better served at a bigger club.
IMO, the extension was just a stay of execution. Now, it's more a question of who he goes to rather than when.