FIFA on Monday confirmed that it will take no retrospective action against Colombia's Juan Camilo Zuniga for the collision during Colombia's 2-1 World Cup quarterfinal loss to Brazil that resulted in Neymar's fractured vertebra.
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"The incident ... did not escape the match officials' attention, which is the first of two cumulative and necessary conditions," a FIFA statement read. "First and foremost, the chairman of FIFA disciplinary committee wishes to state he deeply regrets the incident and the serious consequences on Neymar's health."
Brazil's star forward was involved in a collision with Zuniga in the 88th minute of the match.
FIFA said its disciplinary panel "cannot consider this matter" under the rules and declined to open proceedings against Zuniga.
FIFA's panel also received a complaint from the Confederation of Brazilian Football.
Zuniga, who apologised on Saturday, kneed Neymar in the back when jumping into him at high speed. Neymar sustained a fractured third vertebra and will be sidelined for about 45 days.
In a separate decision, the panel also refused to consider a Confederation of Brazilian Football appeal against captain Thiago Silva's yellow card on Friday in Fortaleza.
Silva's second caution of the tournament triggered a one-match ban, which he will serve in the semifinals.
Brazil will therefore be without its best player and its captain against Germany on Tuesday in Belo Horizonte.
Spanish referee Carlos Velasco Carballo did not show Zuniga a yellow card, and FIFA's disciplinary panel considered the incident judged on the spot.
The seriousness of an injury could not be weighed in a disciplinary decision, nor was mistaken identity a factor in the case, FIFA added.
Information from The Associated Press was used in this report.