Football's ruling body FIFA is "extremely satisfied" with the debut of the video assistant referee (VAR) at the World Cup in Russia and the standard of refereeing in general after six days of action.
"FIFA is extremely satisfied with the level of refereeing to date and the successful implementation of the VAR system, which on the whole has been positively accepted and appreciated within our football community," a statement said on Wednesday.
"It is acknowledged that there will still be discussion and divided opinion surrounding certain decisions and we appreciate you understanding that it is not possible for FIFA to comment on each and every situation."
Four penalties have been awarded via VAR in the 17 games played so far, and one possible red card incident reviewed.
Controversial incidents include Brazil pleading in vain that a foul was committed ahead of Switzerland's 1-1 equalizer against them; and England calling for a penalty during their 2-1 against Tunisia.
VAR is making its debut at the World Cup but was already tested at the Confederations Cup last year and the Club World Cup. It is also being used in domestic leagues such as Germany's Bundesliga and Italy's Serie A.
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