Parramatta hooker Casey McGuire will have an MRI scan on Monday to determine the severity of a calf tear suffered in Friday night's NRL loss to South Sydney.

McGuire could be looking at an extended stint on the sidelines after leaving the ANZ Stadium pitch in the 31st minute of the 32-18 loss to the Rabbitohs.

The 31-year-old former Queensland representative, who returned to the NRL this year after four years in France, had been one of his side's stronger performers on an otherwise forgettable night for the Eels.

He was instrumental in halfback Jeff Robson's 13th minute try with some clever work from dummy-half and will be sorely missed by a Parramatta side that has struggled in the past two weeks after a season-opening win over the Warriors.

The Eels have looked off the pace since then in losses to Penrith and Souths and captain Nathan Hindmarsh said they had too often slipped back into some old habits rather than sticking to new coach Stephen Kearney's discipline-first gameplan.

"There's times where you do slip a bit into your old ways but that will disappear quite quickly I think," Hindmarsh said.

"We've had long enough under Steve now to know what we've got to do and the game-plan we're using so we've been doing it since before Christmas.

"Just sometimes we tend to slip into a bit of other season stuff."

Hindmarsh finished the match with a sore ankle but is in no doubt for next weekend's clash with North Queensland.

But Parramatta could be without impact forward Fuifui Moimoi after he was placed on report for a 47th-minute high shot on Rabbitohs prop Ben Ross.

At the least, Moimoi can expect a spray from Kearney, who admitted he had an issue with the prop's discipline after he was sin-binned for dissent following the incident.

"I have to have a good look at it," Kearney said. "That's one thing.

"I thought our completion rate was way down there in comparison to there's so that was (also) an issue."

Kearney is hopeful what goes around will come around for the Eels after they had two tries disallowed within the first six minutes of the match.

"We got a couple of rough calls but that happens in footy and next week, fingers crossed, they might go our way," he said.

"But I'm not holding my breath."

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