Two apparent errors at the World Cup have highlighted the flaws in a system that requires referees to make calls in a split second, and sometimes unsighted, on whether a ball has fully crossed the line or not.

FIFA communications director Markus Siegler on Monday was adamant soccer's world governing body will not resort to having officials making decisions on video replays, and there are no other fallback devices for referees.

French striker Thierry Henry blamed referee Benito Archundia for not awarding his team a goal Sunday in the first half against South Korea when Patrick Vieira's header appeared to cross the line. The match ended 1-1.

"I'm sure it went in, but it wasn't given ... that's part of the game," Vieira said.

Argentina complained it was deprived of a goal against Ivory Coast in similar circumstances.

Siegler said FIFA had been investigating technology to use in contentious situations, but so far nothing had met the standards.

In partnership with a ball manufacturer, a computer software engineering firm and the International Football Association Board ,which governs the rules of the game, FIFA tested a microchip ball at last year's under-17 world championship in Peru.

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