Newton is out with a knee and dead leg problem while Pongia has a shin and dead leg, Wigan do include Scrum Half Adrian Lam on the bench after injury.
Warriors Coach Mike Gregory has named the following line-up -
Kris Radlinski, Brian Carney, Martin Aspinwall, David Hodgson, Brett Dallas, Sean O'Loughlin, Luke Robinson, Terry O'Connor, Mark Smith, Craig Smith, Mick Cassidy, Danny Tickle, Andrew Farrell.
Subs - Adrian Lam, Danny Sculthorpe, Paul Johnson and Gareth Hock.
Graham Emmerson - Wigan Warriors Press Officer