But IRB is unswayed by concerns about controversial tries and sendings-off Two of the world's leading coaches in sevens have called on the International Rugby Board (IRB) to appoint a video referee for the final on Sunday. New Zealand's Gordon Tietjens says a video referee should be used to adjudicate on dubious tries - as is the case in 15-a-side rugby - while Argentina's Hernan Rouco Oliva says television replays should also be used to judge foul play. But an IRB official said there was no pressing need for change. Oliva said: 'We have been the victims twice this season in a cup final, where we have been one man down at crucial stages, because of refereeing decisions which, seen later on replay, showed a different picture.' Argentina lost in the finals of the IRB Sevens in Wellington and Los Angeles to New Zealand. 'I think the referees are good people and they try to do a job as best as they can,' Oliva said. 'But sometimes they pay more attention to the smaller teams than the major ones and penalise us more than others. A video referee will be the best way to decide who is right or wrong. 'It is important we have a video referee, especially for important matches like the World Cup final.' Long-standing Kiwi coach Tietjens, one of the most successful coaches in world sport, agreed with his Argentinian counterpart that a TV referee would be ideal. But he said it was mainly necessary to adjudicate controversial tries like the one England captain Simon Amor scored in the London Sevens last season to give the home team victory over the Kiwis. 'In replay, we saw the ball was not grounded,' Tietjens said. 'We lost, but the result was academic as we had already wrapped up the IRB Sevens title. But it would have been a travesty of justice if that score had decided the champions. '[Videos] could be used in the case of foul play too,' Tietjens said. 'In one instance this season, we had the wrong guy sin-binned. I believe video referees should come into play for important games.' A senior IRB official discounted any moves to have a video referee on Sunday, saying there was no pressing need for change. 'We have looked closely at this issue in the past, and we feel there is no need for a video referee presently,' said Mark Egan, IRB Sevens manager. 'Of course, this could change in the future. But for now, we have two in-goal touch judges to help the referee adjudicate on tries. 'At the moment in 15s rugby, a video referee only adjudicates on tries. It is up to the referees and the touch judges to call the fouls and we intend to keep it that way and also rely on the men out there for decisions on tries too. 'It will be unrealistic to call for a television replay every time there is a disputed decision,' Egan said. According to Egan, the IRB's 'zero-tolerance' approach adopted a couple of seasons ago has worked pretty well to stem foul play. 'A couple of seasons ago there was a series of incidents where there were mass brawls on the pitch,' he said. 'We brought in a rule that foul play would not be tolerated at all, or for that matter even time-wasting tactics like throwing the ball away and preventing the other team from taking a quick tap penalty. 'We find this zero-tolerance policy has worked well. Our goal is to make sure that it is a level playing field for everyone.' But both Tietjens and Oliva have doubts and insist that modern technology should be used to assist officials. 'In today's professional era, the use of video referees certainly wouldn't be out of place,' Tietjens said. Oliva said: 'When you are down one player in sevens rugby, it can cost you the match. I just hope something can be worked out in the future where we can rely on technology. I hope the IRB will think about this.' The 24-team World Cup, starting on Friday at the Hong Kong Stadium, will be officiated by nine professional referees and 12 touch judges.