Warrington head to London on Friday a week ahead of their Challenge Cup final date with Leeds, with coach Tony Smith warning that places in his Wembley team are still up for grabs.
Smith, a two-time winner of the cup during his time with the Wolves, has rested six frontline players for the meeting with a rejuvenated Broncos side at the Stoop, giving some of his fringe players the chance to impress.
"It's way too soon for me to know my line-up, it's totally undecided," the Australian coach said. "There are so many twists and turns and things that can happen to you. There are certainly some people who you would imagine would be favourites in terms of selection, but there's no guarantees."
He added: "The team changes at London and I have a responsibility to give some of the boys (coming in) an opportunity to play for jerseys. They all buy into the rotation, but they also want to put their best foot forward to lay stake for a claim on one of the jerseys for the next week."
Although Lee Briers, Garreth Carvell, Ben Harrison, Brett Hodgson, Joel Monaghan and Ben Westwood are highly unlikely to miss next week's game as a result of Friday's rest, the likes of Chris Bridge, Tyrone McCarthy and David Solomona will be looking to push a claim for any unclaimed spots.
Broncos' interim coach Tony Rea is boosted by the return from injury of Michael Robertson and from illness of Will Lovell.