VIDEO referees Bill Harrigan and Paul Simpkins have been instructed to keep a close eye on any grapple tackles or other illegal wrestling manoeuvres in the Storm's semi-final clash with Brisbane at Suncorp Stadium tonight.

With Broncos players expected to follow the lead of the Warriors in last Sunday's win over Melbourne by reacting to any tackle they feel is suspect, tensions are likely to run high as the two teams battle it out for the right to play Cronulla next weekend.

The NRL match review committee looked at 17 grapple tackles or similar incidents from last weekend's opening round of finals matches but found none serious enough to warrant a charge.

However, officials admitted more penalties should have been awarded against the Storm and video referees have been told to help detect illegal holds in the remaining play-off games.

"In the finals, we've got two guys in the video referees' box so one of them can look out for that sort of stuff," referees boss Robert Finch said. "That's not just in the Storm-Broncos game but in all games from here on in.

"We said after our debrief session last week that there were some more tackles that should have been penalised but that's with the benefit of hindsight and after watching a video shot from above.

"When the referee's down at ground level it can be hard to detect, so that's where the second video referee can give him a hand. More than 20 per cent of penalties against the defensive team this season have been for player safety issues, so we have to be vigilant."

After studying a replay of the match in Melbourne, video referee Steve Clark told officials there were more incidents that may have warranted action during the game, and Harrigan and Simpkins will be on the lookout to ensure none escape the attention of whistleblower Shayne Hayne.

With the Storm easing up on their use of wrestling tactics after referee Jason Robinson began penalising them late in the first half, it is anticipated Hayne will want to act early if he becomes aware of any illegal tackles.

Hayne will no doubt get some help from the Broncos players, who took exception to the Storm's tactics when the two sides clashed late last year, while Brisbane coach Wayne Bennett alerted NRL officials to a new wrestling hold that has since been nicknamed the "crusher".

"There are some teams that react as soon as an arm goes near the head or neck," match review chief Greg McCallum said. "They point to their neck and try to get the referee or the touch judge to act."

Finch said he had spoken to Melbourne coach Craig Bellamy about a number of incidents in last week's game. "We provided him with feedback on the game and he agreed with that summation of the game," Finch said.

But the Storm this week accused the Warriors of trying to pressure the match officials.

Meanwhile, those who know Bennett well expect him to use the events of the past week, including sexual assault allegations against three of his players, to galvanise the side to win a match he described as "a grand final".

Should the Broncos lose, it would be Bennett's last match in charge of Brisbane after a remarkable 21-year reign that yielded six premierships.

The Herald has been told that he would not have even discussed the off-field drama with the players as a siege mentality takes hold at the Queensland club.

Storm second-rower Ryan Hoffman (ankle) and prop Jeff Lima (knee) remain in doubt after suffering injuries in last Sunday's 18-15 loss to the Warriors. Hoffman is only likely to play with the aid of a pain-killing injection.