"Tomorrow will be the first time that goal-line technology will be officially used in a game," FIFA secretary-general Jerome Valcke said today. "The tests are done; and the installation tests were successful."
Hawk-Eye is a British camera-based system already used in tennis and cricket. GoalRef is a Danish-German project using magnetic sensors to track a special ball.
Before each match, officials will test the system is working in both goals.
The referee will continue to have full autonomy in making any final decision during the match, using goal-line technology as an additional aid.
The data from the Club World Cup will be used to help FIFA decide, by the end of March, which technology it will use for the six venues at the 2013 Confederations Cup in Brazil. The Confederations Cup system will then be used at the 2014 World Cup.
"The referee has the final decision," Valcke added. "The technology won't change the speed, value or spirit of the game."