The final minutes of Sunday's World Cup knockout round showdown between the Netherlands and Mexico were tense for fans of both teams.

But then came a moment that will have Mexico fans seething for the next four years, as some fans thought that Dutch forward Arjen Robben appeared to take a dive as he drew a foul by Mexico's Rafael Marquez that set the Netherlands up for the game-winning goal that sent the Mexican team home.

Robben did admit to flopping during the match, but said that he only did so during the first half, not in the incident with Marquez, which was ruled an official penalty.

"I have to apologise. In the first half I took a dive," he told a Dutch TV station, according to the BBC. "The one at the end was a penalty."

Mexico's coach, Miguel Herrera, said that it was unfair for the forward to even remain on the pitch after flopping earlier in the match.

"Robben dived three times," he said. "You should caution a guy who is trying to cheat, and then if Robben did it again he would be sent off."

Hererra went on to question the loyalties of the Portuguese officials who called the match, the Mirror reported.

"And why did FIFA choose a referee from the same confederation as Holland instead of one from South America, Asia or Africa?" he asked. "The doubtful decisions were always against us. We have to say it in capital letters, in three matches we had horrible refereeing. The man with the whistle knocked us. ... I want the referee committee to take a look and that the referee goes home just like us."

Like in America's National Basketball Association, the question of what to do about flopping in international soccer has become a hot-button issue.

FIFA has made statements about cracking down on the practice, but players continue to do it throughout the 2014 World Cup in Brazil, and many fans and players are getting fed up, as bad calls seem to be keeping teams from advancing in the world's most-watched sporting event.

On Monday, FIFA spokeswoman Delia Fischer said the body's disciplinary committee "will look into serious infringements" in response to questions about the Robben incident, according to CBC.

"We ask the players to play in the spirit of fair play," Fischer said. "It's up to the referees to manage a match."