Canberra Raiders coach Ricky Stuart certainly couldn't see any in the final six minutes as the Green Machine looked to mount a comeback against South Sydney Rabbitohs at Canberra Stadium on Thursday night.

Not once, but twice the controversial NRL bunker, led by Henry Perenara, disallowed Raiders tries for obstruction.

They were chasing the game, trailing 32-20 going into the final 10 minutes of the game - with Souths down a man after Jacob Host was sent to the sin bin for a professional foul.

The second one was definitely harsh - Raiders second-rower Corey Harawira-Naera slipped over as the lead runner, but didn't even make contact with the Rabbitohs defender before Jack Wighton burst through the defensive line for what would've given the home side a slim chance of sending the game to extra time with just three minutes remaining.

But Perenara ruled Harawira-Naera had obstructed.

That came just four minutes after Wighton had crossed only for it to be ruled out due to Emre Guler obstructing Benji Marshall.

Guler had run past the defensive line, most of which had stepped up - except for Marshall, who then feigned to tackle Guler.

Perenara also waved that try away and the Rabbits held on to win 34-20.

Stuart was left scratching his head about both calls.

"It was smart by Marshall to run forward and try and tackle a person that was going to help him get a penalty, good gamesmanship," he said.

"There was no way in the world they were going to tackle either of those players there.

"Anyone with a bit of common sense in regards to rugby league knows that they were two tries, but I'll leave it at that.

"[Those] type of interpretations in the game it's going to be a blight on the game as well, we've been talking about it for years.

"You can't run forward and tackle somebody in front of you and not try and tackle the person with the football can you?"

The Raiders were on the wrong end of an 8-1 penalty count from referee Ben Cummins, although they did have seven six agains to Souths' zero.

Stuart said he would speak to the NRL about some of the interpretations, which he felt the Raiders had been on the wrong side all season.

He couldn't care less if he was labelled a whinger after the loss.

"I will. This has been happening a lot this year to us. I'll look like a whinger, which I don't really give a shit about being labelled a whinger," Stuart said.

"When you get a game out there where it's 8-1 in penalties, I just think that probably needs a discussion.

"The ruck was so slow tonight mate. I can't believe it was only seven [six agains]."

But having said all that, Stuart felt his own side had been their own worst enemy as well with some of the tries they're letting in.

He said they were consistently letting in a couple of tries a game that were preventable.

"Souths [are] playing good footy at the moment. I thought we equalled the performance tonight, I was happy with a big part of our game," Stuart said.

"We can't keep giving away a cheap 12-18 points a game. That's what we're doing, we've only got ourselves to blame, no one else.

"We're giving up two to three tries a game that are, how do I say it, they're tries we can stop. Unfortunately it's not happening."

Meanwhile, things didn't look good for centre Sebastian Kris, who looks like having an ankle syndesmosis injury that could rule him out for 2-6 weeks.