Gambia's referee Gassama: VAR not perfectpublished at 14:36 British Summer Time 11 June 2018
One of Africa's most respected referees, Gambian Bakary Papa Gassama, says Video Assistant Referee (VAR) technology cannot eliminate every mistake made by match officials.
Gassama used VAR at last year's Confederations Cup and will be able to use the technology again at the World Cup in Russia.
But he says everyone from referees to fans are still learning about how to make the best use of the system.
Gassama told BBC Sport:
Quote MessageWe've seen big, big mistakes by referees, and top referees for that matter, but VAR cannot eliminate - but can reduce big mistakes."