Halfback Williams (shoulder) and star fullback Dugan (ankle), both didn't train in Auckland this morning, forcing Canberra into a late reshuffle.

Reece Robinson will shift from wing to fullback, while veteran utility Shaun Berrigan will slot into the no.7 jersey.

"Sammy did a bit of contact at the start [of training] to see what the shoulder was like, but it doesn't look likely [he'll be playing] to be honest," Furner said.

"Dugan's the same, he's had scans and it's not as bad as first thought, but we'll be likely to go in without them."Berrigan's shift to the halves means hooker Travis Waddell will come onto the bench, but Furner remained tight-lipped who would slot in at wing.

Toyota Cup star Edrick Lee has performed well when elevated to first grade this year, but it remains unclear whether he will be drafted into the squad.

"We've got two options there, and we'll just leave it at that," a cagey Furner said this morning.

"We'll make that decision tomorrow."

The injuries to Williams and Dugan means Canberra has just 18 fully fit players to choose from which made the trip.

An option the Raiders may consider is shifting second rower Joel Thompson into the centres, with Blake Ferguson returning to the wing. Canberra will be guaranteed a top eight spot should Melbourne beat Wests Tigers at Leichhardt Oval tonight.

However, a Tigers victory means a finals berth would still be up for grabs at Mt Smart Stadium tomorrow.