I’m sure they’d have had a look and maybe put off by wages/fee. Also maybe he feels more certain of being first choice. At Arsenal he’s competing with Saka, at Chelsea **** knows, Newcastle he maybe sees as beneath him. Doubt Brentford are desperate to sell and he’s probably loyal enough to not be kicking off for a particular move.
Or there is the small matter of United being massive even if they’re a car crash now and for the foreseeable future. Still think money is the main draw for 97% of players over Champions’ League, location or anything else.