Hull KR winger Ben Cockayne has been ruled out for up to 10 weeks with a knee injury.
The Robins have confirmed the 30-year-old picked up the injury in Sunday's defeat by Castleford Tigers.
Head coach Craig Sandercock has recalled Greg Eden from his loan spell with Salford Red Devils as cover.
The Robins are already without back-row forwards Jordan Cox and Kevin Larroyer while prop Justin Poore is out for the season with a knee problem.
Eden, 23, joined the Red Devils on loan in April and made four appearances for Iestyn Harris' side.