Although the Warriors lost the game 22-20, Mossop scored a try. This made him only the second player after Denis Betts to have scored on both his initial and second debuts for the club.
Having endured a frustrating time in the NRL with Parramatta before his return, largely due to a shoulder injury, Mossop was relieved to have come through the game intact.
“I feel really good and I think with every game now I’m just going to be picking up more and more confidence with the shoulder,” he told his club’s official website.
“That’s two games now, one with Workington and one Wigan, hopefully the more I can play the stronger and better I’ll become.
“When I worked it out I think it’s been about eight months, I’m just looking at as I went away for eight months to get my shoulders sorted and do some rehab.
“It’s great to be back playing with the boys who I’m familiar with. Having been at Wigan for so long beforehand I think I’ve fitted into the structures really well.”
The forward had no idea he had made history when he crossed the whitewash to score at Hull KR.
“To be honest it never even crossed my mind when I went on,” he added.
“I just wanted to do the basics well for my first game back.
“After being out for so long I didn’t want to overcomplicate things, make sure that my carries were strong and in defence show Shaun Wane enough to make sure I stayed in this week and with a bit of luck I’ll have done that hopefully.”
Warriors coach Shaun Wane was also pleased with his player’s efforts.
“It was good to have him back,” he said.
“His ‘D’ still needs some work, but he’s a big body.
“I thought he did really well. He’s not played for eight months and he took his try really well.
“But not only that, his other carries were really good.”