Playing again are the full-back Wayne Proctor, centres Nigel Davies and Gareth Thomas and lock Derwyn Jones.
Wales have just three games before the second international in Sydney on 22 June and Bowring said: "The players have been told they are fighting for places in the Test side."
Wales have injury worries over captain Jonathan Humphreys (hand), centre Leigh Davies (shoulder), scrum-half Robert Howley (back) and prop Christian Loader (ribs). "The major concerns are over Jonathan and Leigh, although both should be fit by next week," Bowring said.
Davies, the Llanelli centre, captains a Welsh side for the first time with his midfield partner Thomas now the only ever-present in the squad and playing his fifth straight game of the trip.
Wales spent a lot of time in yesterday's training session trying to shore up a defence that has leaked 21 tries - including 10 against Australia Capital Territory and seven against the Wallabies - in just four games.
AUSTRALIA B: S Larkham; M Hardy, D Herbert, R Tombs, B Tune; S Bowen, S Payne; D Crowley, M Foley, A Heath, D Giffin, J Welborn, B Robinson, T Gavin (capt), M Brail.
WALES: W Proctor (Llanelli); S Hill (Cardiff), G Thomas (Pontypridd), N Davies (Llanelli, capt), D James (Bridgend); A Thomas (Swansea), A Moore (Richmond); A Lewis (Cardiff), B Williams (Neath), L Mustoe (Cardiff), P Arnold (Swansea), D Jones (Cardiff), A Gibbs (Newbridge), E Lewis (Cardiff), K Jones (Ebbw Vale). Replacements: N Jenkins (Pontypridd), R Howley (Bridgend), H Taylor (Cardiff), J Davies (Neath), M Voyle (Newport), S Williams (Neath).Reuse content