Lampard controversy

The use of goal-line technology, to help match officials in cases where it is not immediately clear if the ball has entered the goal, was approved by soccer's rule-making body, the International Football Association Board (IFAB), last year.

The use of goal-line technology had previously been rejected by FIFA, which performed a U-turn following the controversy over Frank Lampard's disallowed goal for England in the 2010 World Cup match against Germany.

Replays clearly showed that the ball had crossed the line after bouncing down off the underside of the crossbar, but match officials did not award the goal. Germany, 2-1 ahead at the time, went on to win 4-1.

However, goal-line technology is not favored by European soccer's governing body UEFA, which instead prefers to employ two extra linesmen, one on each goal line.

FIFA president Sepp Blatter has already said that extra linesmen are unlikely to be used at the World Cup.

Many critics think that football should go further and allow the use of video replays to help referees make decisions concerning offside, handball and fouls.

Referees have to make split second judgments with the naked eye while millions of television viewers are treated to slow-motion replays, from different angles, which often show clearly whether the official was right or wrong.