Hull full-back Jamie Shaul is still at least another month away from a return to action due to concussion.
Shaul, 26, suffered the knock in the 28-24 win over London Broncos in March and has already been sidelined for a month.
The club’s head of strength and conditioning, Paul Hatton, told the official club website: “Jamie is still suffering the the affects of his concussion he picked up against London.
“He has had a reoccurence of the symptoms and with the new rules in place, he has to go through various tests before he can play. He hasn’t passed them tests so he’s going to be out for another month.
“The specialist has to clear him before he’s allowed to play.”
Joining Shaul on the sidelines is Dean Hadley, who is ruled out of the visit of Catalans on Friday due to concussion protocol.
Andre Savelio (ankle) and Jordan Lane (knee) are out for a month, and the club are awaiting results of scans on Carlos Tuimavave’s leg injury.
Jack Brown and Josh Bowden are two weeks away from fitness, but Levy Nzoungou is now available after recovering from an ankle injury.