Real Madrid are among the six teams involved in the Club World Cup which is no surprise, but there will be something new taking place at this month's tournament too as FIFA will test the use of video assistant referees to help with key decisions.

The extra official will have access to all broadcast feeds inside an operations room, allowing them to provide information to the referee to correct mistakes in "match-changing" situations.

The on-field referee will still have the final decision and will also be able to review footage on a pitchside monitor. The referees and video assistant refs involved at Yokohama stadium spent time reviewing video clips of real match situations and participated in practical training sessions with players.

All of this is building upon the successful trials recently held at international friendly matches in Italy. The move is seen as an important test before competition organisers in Australia, Brazil, Germany, the Netherlands, Portugal and the US begin trials next year.

"We explain to the referee that sometimes when the situation is very difficult you can have help from outside. Only when it's a clear mistake and everybody knows it's a mistake. 30 centimetres inside or outside, a clear penalty miss or a clear handball," said Massino Busacca, FIFA head of refereeing.