Didn't he do his acl? I think the stats show the majority of players who ping there acl drop a division within 3 seasons.
It's really does take you down a peg. Essien was world class before and poor back up after. Owen was so bad after. Even frimpong looked good on loan at wolves has dropped 2 or 3 divisions. Theo is a shadow of himself.
If he was Real standard dropping a level could still have him arsenal standard.