It comes after the NRL admitted to a costly refereeing blunder in the lead-up to one of Parramatta's tries in their come-from-behind 22-16 win over the Raiders.

In that same game, Eels prop Peni Terepo was put on report for a swinging arm that left Canberra winger Jordan Rapana with blood streaming from his nose.

Rapana was forced from the field for a head injury assessment and missed the final 12 minutes of the first half - when the momentum started to swing Parramatta's way.

Terepo has since been charged with grade two dangerous contact with the head/neck and will miss three games with an early guilty plea - four if he contests it and loses.

He has until Tuesday 12pm to enter his plea.

Furner questioned why players were sent to the sin bin for repeated penalties, but not foul play.

"We were shocked that Terepo didn't get sin binned," he said.

"I think it's strange that you get sin bins for players holding someone down in a tackle and not for that.

"Particularly when you lose your player and have to shuffle your backline.

"Thankfully Jordan came back on, but if he didn't we'd be down a player.

"In those instances there's plenty of time [for the bunker] to look at it because the player is down with a clear injury and you've got time to review it."

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At his weekly briefing, NRL head of football Graham Annesley admitted the Raiders were dudded in the lead-up to Blake Ferguson's try seconds before half-time.

He said Eels captain Clint Gutherson had lost the ball in the tackle - something both Raiders players Jack Wighton and Charnze Nicoll-Klokstad pointed out to the referees at the time.

Ferguson's try cut the margin to 16-12 at half-time with all the momentum going Parramatta's way.

"[It was an] important decision that was taken in the context of the game ... where Gutherson is tackled," Annesley said.

"He loses control of the ball and regathers, gets up, plays the ball and in that set of six the Eels score a try.

"There is some suggestion that the ball might've been knocked out of his hand by the defender [Wighton], but either way it's a loose carry and it's certainly not a play on situation because he has lost possession of the ball."

Furner said while it was disappointing the error led to a try, it wasn't the reason the Raiders lost.

"I saw that on the screen, I thought it'd be pulled up and it wasn't," he said.

"[It's] disappointing that it led to the try ... I thought they [the bunker] did tip them [the referees] up on those things.

"At the end of the day we played so poorly for 40-odd minutes, that's the reason why we really lost."