Think its more pressing to give Klassen a go, its his preferred position and we have nothing to play for so why not? We probably have a bit more leeway with Vlasic where as this could be Klassens only opportunity to stake a proper claim
I see Klassen and Davies fighting over who will play alongside Gana Gueye.
Klassen hasnt got the pace (nor has Siggy) to play the 10 role, Vlasic is neat, tidy, great touch, and can pick a pass.
Klassen going by his goals for Ajax, is a late breaking midfielder... I know he's a 10 as well, but in the Prem, i feel he is better suited in the midfield, rather than in the attacking third.