Hull captain Richard Swain faces a long lay-off after breaking his arm during their 20-16 victory over London. The New Zealand international hooker, an ever-present last season, went off near the end of the win, London's first home loss of the season.
"Richard has broken his arm and that is a blow," said coach John Kear.
"He's been the cornerstone of our team for the last two seasons but these things are part and parcel of a high-impact game."