Bulls duo James Donaldson and Adrian Purtell will undergo scans tomorrow but both men seem set for several weeks on the sidelines.

Loose forward Donaldson, who looked to be getting back to his best form, sustained a knee injury during the first half of Sunday’s victory at Castleford.

New recruit Purtell was struck down by a chest injury during the first half of the 20-12 win and never returned after half-time.

While the loss of the duo is a major blow to Mick Potter’s side, Purtell’s absence could be offset by the availability of Keith Lulia for this weekend’s home clash with Wigan.

The centre has yet to feature for the Bulls following his close-season arrival from Newcastle Knights on a two-year deal due to a hamstring strain.

But the 6ft 4in Cook Islands international is edging towards full fitness and is bidding to come into contention to face Shaun Wane’s side.

Karl Pryce is also hoping to be passed fit to face his former club as he looks to shake off a hamstring injury.

Potter, meanwhile, says the Bulls will go into the Wigan clash on a high after kick-starting their campaign at Castleford.

Potter said: “Whatever was thrown at us, the players stood up to the challenge, and I couldn’t fault their effort.

“That bodes well for us going into the Wigan match, which we know will require another massive effort.

“I’m obviously not happy with the injuries but we’re up and running and that’s given everyone a massive lift.”