If they pay his wages and a loan fee, then it's a decent deal in my eyes.
How anyone can have watched him last season and seen any reason to persist is completely beyond me. Unfortunately, he's completely out of his depth in English football.
20m is still way overpriced for him and would be good money. Look at what he has shown and decide if you would be happy if we paid 20m for a player of his calibre this summer.