FIFA President Sepp Blatter on Saturday said goal-line technology "works" and that referees were "happy" to have it, as a trial of two systems at the Club World Cup in Japan enters its final stages.
The world body has been testing camera-based HawkEye, and GoalRef, a German-developed technology which uses magnetic fields near the goal and a ball fitted with a special chip, at the intercontinental championship.
Although the Club World Cup has yet to have a contentious goal-line decision for the two technologies to judge, Blatter said the early signs were good.
"For the time being we can only say 'it works'," Blatter told a news conference in Tokyo, a day after FIFA held its final Executive Committee meeting of the year.
"We have had no critical situations so far and we will make an assessment after the final matches tomorrow.
"But the one thing I can say is that the referees are happy to have this help for them because they know now that if there's a conflicting situation it is possible to get the assurance to say if it was or wasn't a goal."
FIFA granted licences to Hawk-Eye and GoalRef following a lengthy testing process lasting around two years.
They were galvanised into action by England midfielder Frank Lampard's long-range shot against Germany in the 2010 World Cup which was clearly over the line but was missed by the officials.
GoalRef will be tested in the Club World Cup's final two matches at Yokohama's International Stadium on Sunday -- the third place play off and the final between Corinthians and Chelsea, in which Lampard is expected to feature.
HawkEye's trial ended on Wednesday when Al Ahly lost to Corinthians at Toyota stadium.
One is likely to be chosen for June's Confederations Cup in Brazil, and the World Cup in 2014, following an analysis of their performances during the Japan showpiece.