"That's why we wanted them to play this game because they're playing at a level below where they should be."
Caskey said he was particularly after talent for the seven jersey and at and first-five eighth.
"We also need another good communicator and somebody with a bit of game nous."
The match will also be a chance for the side to get used to new rules, mainly around the breakdown, which will be used in Wanganui's upcoming Ranfurly Shield challenge against Waikato but not in the Heartland Championship.
Caskey said a more competitive club season had been good for the standard of rugby in Wanganui this season.
Meanwhile, Simon Dibben and Lindsay Horrocks were late inclusions in the squad as injury cover.
Wanganui also have a match against Taranaki B after the club finals weekend before the Ranfurly Shield challenge on August 6 and the Heartland opener against West Coast in Whanganui on August 27.
-Tonight's match at CET Arena in Palmerston North kicks off at 6.30pm.