WARRINGTON Wolves and Castleford Tigers have revealed their 21-man squads for Saturday's Challenge Cup semi final.

Steve Price makes two changes for The Wire - one of them enforced through Jason Clark being sidelined with a calf injury.

> A full update on Jason Clark's injury can be found here

Nathan Roebuck also drops out while Ellis Longstaff and Connor Wrench - both of whom have been on loan at Championship side Newcastle Thunder - are brought in.

Wire squad: Sitaleki Akauola, Blake Austin, Rob Butler, Josh Charnley, Daryl Clark, Mike Cooper, Ben Currie, Matt Davis, Chris Hill, Jack Hughes, Toby King, Tom Lineham, Ellis Longstaff, Jake Mamo, Robbie Mulhern, Joe Philbin, Stefan Ratchford, Josh Thewlis, Danny Walker, Connor Wrench, Gareth Widdop

Castleford are without George Griffin through suspension but can welcome back several key players.

Niall Evalds, Adam Milner, Alex Foster and Gareth O'Brien return in place of Griffin, Danny Richardson, Greg Eden and Lewis Peachey.

Tigers squad: Niall Evalds, Derrell Olpherts, Peter Mata'utia, Michael Shenton, Jake Trueman, Liam Watts, Paul McShane, Oliver Holmes, Cheyse Blair, Adam Milner, Nathan Massey, Alex Foster, Jacques O'Neill, Tyla Hepi, James Clare, Jesse Sene-Lefao, Daniel Smith, Suaia Matagi, Jordan Turner, Brad Martin, Gareth O'Brien