Referee Tony De Las Heras was taken to hospital after being accidentally knocked out during South Sydney's 44-12 win over Brisbane at Suncorp Stadium on Friday night.

De Las Heras, who was struck on the head by Brisbane forward Tonie Carroll's knee after colliding with Souths winger Jamie Simpson, suffered convulsions on the field before being ferried off the ground by the medicab.

The early report from the medical room had suggested he was OK.

But his condition worsened after the game and he was transported by ambulance to St Andrews Private Hospital for observation.

Video referee Tim Mander said De Las Heras had taken quite a heavy knock and was suffering headaches and blurred vision.

"It's the worst one (incident) I've seen in 30 years," said the experienced Mander.

"He's a bit groggy and he's got a very bad headache so they're taking him to hospital for the necessary precautions.

"He was awake and speaking but he was shivering a bit and not quite coherent."

Both coaches said they would be surprised if any action was taken but the NRL's chief operating officer Graham Annesley said the match review committee would look at the incident.

"At first I was disappointed it happened purely because I thought we were going to score a try," said South Sydney coach Jason Taylor.

"But in the end it was pretty serious and hopefully he is alright."

"Jamie was trying to get out of his way as much he was trying to get out of Jamie's.

"It would be ludicrous (for him to be charged) in my opinion).

Brisbane coach Ivan Henjak shared Taylor's opinion.

"It looked like an unfortunate accident," said Henjak.

"Tunza (Carroll) had his eyes on Simpson, I'm not even sure he saw the referee."

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