Although not specifically named by U.S. investigators as part of a probe surrounding FIFA officials, Nike issued a statement.

Nike has issued a statement saying it is "cooperating" with authorities, in the wake of the arrests of several FIFA officials.

On Wednesday, 14 people - including nine FIFA officials - were indicted on charges of racketeering, conspiracy and corruption by Switzerland's Federal Office of Justice, following a request by United States authorities.

The U.S. Department of Justice did not specifically name Nike as part of its investigations, but it did say an unidentified sportswear company bribed a Brazilian soccer official for a sponsorship agreement. Nike has sponsored the Brazilian team for more than 15 years.

Nike did release a statement to the media in relation to the day's events, although it did not confirm that it was the manufacturer being referred to by the DOJ.

"Like fans everywhere we care passionately about the game and are concerned by the very serious allegations," Nike's statement read. "Nike believes in ethical and fair play in both business and sport and strongly opposes any form of manipulation or bribery. We have been cooperating, and will continue to cooperate, with the authorities."

Ranked number 15 on Fortune's 2015 list of the World's Most Admired Companies, Nike's worldwide brand is valued at an estimated $15 billion, according to Forbes.

It competes with official World Cup sponsor adidas to be international football's top brand.

Earlier on Wednesday, adidas had been quick to issue a release that stopped short of criticizing football's governing body but did "encourage FIFA to continue to establish and follow transparent compliance standards in everything they do."