By Dan Sloan

TOKYO (Reuters) - FIFA's new micro-chipped ball should cut controversy at the Club World Cup next month.

If the trial proves successful the "smart-ball" could then be used at the next World Cup in South Africa in 2010.

When players from the seven teams contesting December's trophy score, an implanted microchip will send an instant message to the referee's watch, putting an end to possible arguments about whether the ball crossed the line.

The smart ball was not on display at a Tokyo news conference on Friday but will be publicly demonstrated and available to players before the tournament.

FIFA has considered prototypes before but says the smart-ball technology is now game fit.

"A lot of time, energy and money has been invested in development," said Viacheslav Koloskov, a FIFA executive committee member and chairman of the Japan organising committee.

"If everything proceeds well enough, of course, the ball will be widely used at the World Cup in 2010."

A single microchip emits an encrypted signal to four sensors that detect whether the entire ball crossed a goal-line at any height under the bar.

Earlier difficulties with chips becoming loose have been addressed, says co-developer adidas, adding the ball was stress-tested to seven times the force of gravity.

Christian Holzer, a director at chip developer Cairos, says all goal-line variables have been considered.

"There's no problem with any player covering the ball, and the system is not influenced by weather or humans," said Holzer.

Analysis of use in the tournament in Japan which involves European champions AC Milan, Argentina's Boca Juniors, Japan's Urawa Red Diamonds, Mexico's Pachuca, Tunisia's Etoile Sportive du Sahel, New Zealand's Waitakere United and Sepahan of Iran, will be made presented next March.

Reds player Nobuhisa Yamada said he supported the move.

"Many calls are close and controversial," he said. "This technology will help referees make appropriate calls."