Losing co-captain Jason King for the remainder of the NRL season hit the Manly camp hard but they are determined to rise to the challenge without their inspirational prop.

The second-placed Sea Eagles are away to Parramatta on Saturday night, a week after King suffered his season-ending pectoral injury in the 36-8 win over Sydney Roosters.

Sea Eagles coach Des Hasler admitted King's pain was felt by the entire squad.

"They were very disappointed by it," Hasler said.

"It's the presence that Jason brings ... I thought that Kingy's press release was excellent, he said he had every bit of confidence in the people that will take his place.

"That's been a good thing about this side that when players have come in they've stepped up."

Manly lock Glenn Stewart said losing King provided a great challenge for the side.

"Kingy is a huge loss for us on and off the field," he said.

"His talk in particular for the young forwards coming through is great.

"We won't really be trying to replace him but there'll be blokes getting in there trying to do the best job they can.

"We've had a few of these problems this year but the young blokes have really stood up and we'll be looking for the same again next week.

"We have a senior players group and we meet regularly and discuss what sorts of things we can do.

"With Kingy being out now we'll have to take on a bit more of the pressure between the group and look after all of the young fellas."

Popular frontrower George Rose has been promoted from the bench to start in place of King and Stewart is backing him to shine.

"He's been going great for us ... he's been taking the tough hit-ups for us early on and seems to be getting his nose through and getting easy metres for us," Stewart said.

"He'll be getting a bit extra game time and I think his fitness is getting better as well, so he's ready for it."

Parramatta come into the game after a humiliating 56-6 loss to South Sydney but Stewart said that match would count for little on Saturday night.

"You can't turn up any week and think the job's just going to be done or anyone's an easybeat because it's certainly not the case," he said.

"We had a tough game at Brookvale early on in the year where we were pretty lucky to get the win and I'm sure they haven't forgotten that game either."

The sides met in round 15 when Manly five-eighth Kieran Foran broke Parramatta's hearts with a 77th-minute try to give the Sea Eagles a 22-18 win.

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