FIFA President Sepp Blatter says he thinks he can convince football rule-makers to implement goal-line technology.
A high-profile mistake at the last World Cup persuaded Blatter to end his long-standing opposition to the high-tech aids.
The International Football Association Board will assess the latest test results on Saturday before sending approved firms into another phase of checks ahead of a final decision in July.
Blatter says "we don't want a repeat of last World Cup ... I think I can convince the IFAB board that we must go forward with technology."
Although UEFA President Michel Platini is against computer calls, Blatter says he doesn't want to be at "a World Cup and witness another situation. I would die."