it depends on what style of d / m wenger has in mind to he might want big strong dominating type like a carvalho, imbula or one like arteta a holding midfielder who can pass like lars bender or illramendi not big in size quite mobile but very intelligent on how they position themselves but can still plug the gaps in front of the defense, or a seek and destroyer type like le coq but with no
major passing skills but shuttles around the d / m
area and snuffs out all
danger most likely example sven bender.