St Helens have included former England scrum-half Matty Smith in their squad for Sunday's Ladbrokes Challenge Cup semi-final against Catalans Dragons at Bolton.
The 31-year-old Smith, who won the cup with Wigan in 2013, has made only one appearance for Saints in the last three months and is being linked with a move to the Dragons for 2019.
Smith, who is not guaranteed to play on Sunday, is joined in coach Justin Holbrook's 19-man squad by forward Matty Lees and centre Matty Costello as replacements for injured duo Dominique Peyroux and Ryan Morgan.
Costello could be a straight replacement for Morgan but a more likely option is for Tom Makinson to switch to centre, with Adam Swift taking his place on the wing.
The Catalans are without the suspended Greg Bird but coach Steve McNamara recalls captain Remi Casty, along with David Mead, Ben Garcia, Mickael Simon, Lewis Tierney, Benjamin Jullien and Josh Drinkwater after resting them at Wigan last weekend.
Warrington coach Steve Price has called up centre or second rower Ben Pomeroy for the second semi-final against Leeds but is likely to stick with the team that lost 14-12 to St Helens last week.
Forward Jamie Jones-Buchanan, who has not played since May after undergoing knee surgery, is one of eight players added to the Leeds squad.
Ryan Hall, Richie Myler, Anthony Mullally, Brett Ferres, Adam Cuthbertson, Mikolaj Oledzki and Jack Walker are also back in the frame but prop Mitch Garbutt is out with a knee injury and second rower Carl Ablett is a doubt after damaging an ankle in the defeat at Salford.
New signing Jordan Thompson is cup-tied and prop Dom Crosby is ineligible under the terms of his loan move from Warrington.
St Helens: J Lomax, T Makinson, M Percival, A Swift, T Fages, M Smith, J Roby (capt), K Amor, Z Taia, J Wilkin, L McCarthy-Scarsbrook, L Douglas, M Knowles, L Thompson, D Richardson, R Grace, M Lees, B Barba, M Costello.
Catalans Dragons: D Mead, B Wiliame, F Yaha, S Langi, R Casty (capt), S Moa, L Anderson, B Garcia, J Bousquet, M Simon, J Baitieri, M McIlorum, L Tierney, B Jullien, L Albert, T Gigot, M Goudemand, J Drinkwater, K Edwards.
Referee: R Hicks.
Warrington: S Ratchford, T Lineham, B Goodwin, K Brown, T Roberts, C Hill (capt), D Clark, M Cooper, J Hughes, B Murdoch-Masila, D Patton, S Akauola, J Philbin, T King, H Livett, M Brown, J Charnley, B Pomeroy, B Westwood.
Leeds: C Ablett (capt), T. Briscoe, A Cuthbertson, B Dwyer, B Ferres, A Golding, R Hall, A Handley, J Jones-Buchanan, J Moon, A Mullally, R Myler, M Oledzki, M Parcell, N Peteru, B Singleton, L Sutcliffe, J Walker, J Walters.
Referee: C Kendall.