If he does not want to leave, he can go out on LOAN80k per week til 2023 and he is now 29 and will be 30 in october.
why would you want to go anywhere to get less?
Its not in his interest to leave, 50k a week or whatever over say 3 year deal?
30k per week over 2 years = 3million quid.
If he holds out til next summer he can still move and get a 3 year deal somewhere at age 30.
