FIFA claims to be "extremely satisfied" with the quality of refereeing at the World Cup and says the use of video assistant referees (VAR) has been a success.

The new technology is in place at the World Cup for the first time and has been consulted on several occasions over the first week of games.

The introduction of the video review has coincided with a greater number of penalties being awarded. Through the first week of the competition, 10 penalties had been given, matching the total for the entire group stage in 2014.

VAR may not be infallible though. The criticism it has received comes mainly from Brazil where they believe Switzerland's goal in a 1-1 draw should have been disallowed.

England has also had some skeptics on VAR who wonder why contact by Tunisia defenders on Harry Kane on set pieces did not earn a penalty.