The Raiders five-eighth admitted it felt like they knew another second-half slump was on the way as it was unfolding before their eyes.

But he vowed the Green Machine would stick together as they look to break the losing cycle.

The Raiders have lost their past five games - the first time that's happened since 2014 when they dropped five in a row at the back-end of the season - with the latest against Newcastle in Wagga Wagga on Saturday.

And their second halves have become their Achilles heel, not only during that run of losses but throughout the 2021 NRL season as a whole.

They've only won two second halves this campaign - against Wests Tigers and the Gold Coast Titans.

During their run of losses they've conceded 93 points after half-time, while only managing to score eight.

They held a 16-0 lead against the Knights at the break, before letting in four unanswered tries in the second stanza.

It's left Wighton clearly frustrated and he admitted it seemed like their second-half struggles had started to get into their heads.

"Far out man. We're like a broken record, a team of two halves, unbelievable. What can I say," he said.

"That's the way it looks and that's the way it feels a little bit. It's a cycle we've got to break and once we break it we're going to go on a roll I reckon.

"We've just lost the knack of winning you know what I mean."

MORE RAIDERS NEWS

It looked like happening as soon as they came out of the sheds in Wagga Wagga, with the Knights regathering a short restart and then scoring just two minutes later.

The Raiders had plenty of opportunities to score themselves - with Wighton, Caleb Aekins, Sebastian Kris and George Williams all going close - but they just couldn't land the killer blow and the Knights kept coming.

It's been an issue all season, with the hard work done in the first 40 minutes undone in the second.

In total, they've conceded 137 points after half-time and only scored 50.

Wighton said the fact most of their problems were fixable - by doing the simple things and sticking to the game plan - which made it even more frustrating.

"We're all busting our arse and we're all trying for each other, but we just can't seem to win," he said.

"Winning's contagious and we just don't seem to have that at the moment. We're just on a roll of a losing streak, but we're going to stick together.

"There's 16 rounds to go and if we don't stick together it's going to be an extra long season. That's our main focus now is sticking together and looking after each other.

"[We need to be] rolling the ruck mate, deflating their middles so we do earn the right to shift.

"We're going away from the ruck too early and losing possession. It's all stuff that's fixable, that's what's so frustrating."

Wighton also felt that sometimes they weren't on the same page at crucial moments in games.

The Dally M Medallist was thinking one thing, while his teammates were doing another.

Again, he felt remaining united as a group was the key.

"I can only be accountable for myself, you can't control the rest of the team," Wighton said.

"It's a team game and sometimes I'm thinking one thing and they're doing something different.

"I see where I'm at and where I want to be, but sometimes we're going different ways. We'll stick together and go again."

Further compounding the Raiders' woes could be injuries to three key players.

Neither Ryan Sutton (elbow) or Joe Tapine (knee) finished the game, while Jordan Rapana injured his hamstring just before the final siren.

Sutton will get scans after hyper-extending his elbow tackling Knights winger Starford To'a in the 21st minute.

It was a big blow for the Green Machine given the Englishman has been one of their best middle forwards this season.

NRL Physio Brien Seeney tweeted he could miss anywhere between 1-8 weeks, depending on whether there was a dislocation or fracture as well.

Tapine suffered a minor medial ligament strain when he fell awkwardly in a Jayden Brailey tackle.

He had his knee strapped to see if he could come back on, but couldn't and he'll be monitored - with Seeney saying minor strains usually resulted in 1-3 weeks out.

Rapana will also be monitored after hurting his hamstring in the second half and playing on, before feeling it again just before the final siren.

The Raiders have Ryan James and Dunamis Lui as options to cover Sutton and Tapine after the pair had solid hitouts in the NSW Cup, while co-captain Jarrod Croker (shoulder) was expected to return this week.

"We'll see what the end result with those guys [and their injuries are], but we've got to stick together or it's going to be a long season," Wighton said.

NRL ROUND 10

Saturday: Canberra Raiders v Canterbury Bulldogs at Lang Park, 3pm.