Fifa says it will take action if it finds grounds to do so

Their cacophonous din has so far been a soundtrack for the World Cup, to the delight of some and the profound annoyance of others. But organisers said that the vuvuzela, one of the most visible and certainly most audible motifs of the tournament's opening weekend, could yet be banned from inside stadiums.

Organising committee chief executive Danny Jordaan said he would continue to monitor their use and that a ban could be enforced if there were "grounds to do so".

Fifa and organisers have already said that they will ban the instrument if any are thrown onto the pitch or used as a weapon and urged fans not to blow them during national anthems.

"We did say that if any land on the pitch in anger we will take action. We've tried to get some order. We have asked for no vuvuzelas during national anthems or stadium announcements. It's difficult but we're trying to manage the best we can," he told the BBC.

"We've had some broadcasters and individuals [complaining] and it's something we are evaluating on an on-going basis." The BBC and ITV have received complaints from viewers about the background noise and, while both have said they will monitor the situation, they have also made the point that it is important to reflect the atmosphere of the tournament.

Fifa has previously shrugged off complaints from broadcasters, players and coaches about the noise from the plastic horns that are being sold on every street corner in South African host cities.

Following last year's Confederations Cup, there were complaints from coaches, players and broadcasters about the noise. But Fifa said that the horns formed part of the unique African atmosphere of the tournament and refused to ban them.

But Jordaan himself, who battled for 16 years to bring the World Cup to South Africa, said he would prefer the 10 stadiums hosting the World Cup to ring to the sound of singing and dancing than the drone of the vuvuzela.

"I would prefer singing. It's always been a great generator of a wonderful atmosphere in stadiums and I would try to encourage them to sing," he said.

"In the days of the struggle (against apartheid) we were singing, all through our history it's our ability to sing that inspired and drove the emotions."