Seem to recall from this being discussed ad nauseum in Part 1 (or was it 2?) that the issue isn't that they signed him on a £600k per week contract, but that he agreed to restructure his wage payments to help the club handle COVID-related cashflow issues, but they have since been desperate not to pay the backloaded part of the renegotiated contract, and want to sell him in the hope that they can effectively avoid having underpaid him for a long period.
The issue with this strategy being that he has no interest in leaving, and coaches have no interest in sidelining him to force him out because he is very good at football. Staying is win-win for him - gets to play for the club of his dreams while being paid the fortune in wages that he is owed.