Indeed - in absolute terms the player values may be static or even drop, but in relative values compared to their peers, our squad must be increasing with the consistently excellent style of play (and recent run of results).
He was worth somewhat more than that when we got him, given he was a current regular in the Dutch national team.
He apparently had a €1M release clause in his Ajax contract specifically related to a PL club coming in for him. He's only just turned 29 (he's younger than Dunk!) so should have...