JAMES Roby drops out of Saints' 19 man for Thursday night's clash with rivals Warrington Wolves at the Halliwell Jones Stadium.

Matty Costello returns this week after scoring for Leigh Centurions in their win over Swinton on Sunday.

Alex Walmsley (retina), Morgan Knowles (ribs) and Lachlan Coote (knee) are still missing.

Saints travel to second placed Warrington with the League Leaders Shield already wrapped up after victory on Friday followed by Wire’s loss to Catalans in Perpignan on Saturday.

St Helens 19 man squad: 1. Jonny Lomax, 2. Tommy Makinson, 3. Kevin Naiqama, 4. Mark Percival, 5. Regan Grace, 6. Theo Fages, 7. Danny Richardson, 10. Luke Thompson, 11. Zeb Taia, 12. Joseph Paulo, 13. Louie McCarthy-Scarsbrook, 16. Kyle Amor, 17. Dom Peyroux, 19. Matty Lees, 20. Jack Ashworth, 21. Aaron Smith, 22. James Bentley, 24. Matty Costello, 29. Jack Welsby.

Warrington have so far only named an 18-man - suggesting that they are looking to bring in another player - with former Saints scrum half Matty Smith being touted.

Warrington Wolves squad: Sitaleki Akauola, Luther Burrell, Ben Currie, Matt Davis, Riley Dean, Bryson Goodwin, Chris Hill, Luis Johnson, Toby King, Harvey Livett, Jake Mamo, Pat Moran, Ben Murdoch-Masila, Stefan Ratchford, Lama Tasi, Josh Thewlis, Danny Walker, Ben Westwood