Seven Costa Rica players were forced to undergo drugs tests following their shock 1-0 victory over Italy, suggesting FIFA didn't believe the win was legitimate.
Only two Italian players were asked to provide urine samples immediately following the Group D game, which is the usual number requested from each side post-match.
But now football's governing body has come in for criticism for setting their own rules and breaking protocol in a quest to disgrace the minnows.
The unfancied Costa Ricans, who found themselves lumbered with three former World Cup winners, could now top their group if they pick up at least a draw against England in their final group game.
But despite the plaudits Los Ticos have gained for their style of play, FIFA called 'foul' on their hard-fought 1-0 win over Italy.
Goal-scorer Bryan Ruiz was among the players tested for drugs, and former Argentinian superstar Diego Maradona has come out in support of the Central American country, criticising FIFA's 'lack of respect for the rules.'
He said: "If there were seven Costa Ricans, why weren't there seven Italians?
"This is happening because it hurts a lot of people to see Costa Rica get through and that world champions don't get through, because then the sponsors don't pay the cash they promised.
"It's against the rules. Each team sends two to anti-doping. But seven players, never. Taking seven Costa Ricans to doping shows a lack of respect to the players and to the rules.
"Costa Rica had an incredible qualification, they had three world champions in the group and they beat them with good football."
Maradona won the World Cup with Argentina in 1986 but was sent home from the 1994 competition after testing positive for ephedrine.
He had also previously tested positive for cocaine in 1991 and was suspended from football for 15 months.
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