Fifa's major sponsors have put pressure on the organisation in the wake of an unfolding corruption scandal, after the launch of two criminal probes and the arrest of nine Fifa officials.
Visa, one of Fifa's biggest sponsors, has threatened to withdraw its funding altogether and described its "disappointment" with football's under-fire governing body as "profound".
Adidas, Fifa's oldest sponsorship partner, has also expressed concern, while Coca-Cola said the allegations of corruption had "tarnished" the image of the World Cup.
Cobus de Swardt, the managing director of anti-corruption campaigning group Transparency International, said the pressure was now on sponsors to make their influential voices heard.
"If you are putting many, many millions of euros into a business, then you definitely have a right and responsibility to demand that you are not tainted," de Swardt said.
The Fifa bigwigs facing charges
The Fifa bigwigs facing charges
1/14 Jeffrey Webb, 50, Cayman Iskands
A Fifa vice president. His arrest came as a big surprise, as he had been tipped as the man to clean up Fifa once Blatter departs. Webb is also president of Confederation of North, Central America and Caribbean Association Football (Concacaf) and the Cayman Islands Football Association
2/14 Costas Takkas, 58, UK
A British citizen, Mr Takkas is currently an attache to the Concacaf president. He was previously general secretary of the Cayman Islands Football Association, of which Mr Webb is president
3/14 Jack Warner, 72, (pictured), Daryan Warner, 46 and Daryll Warner, 40, Trinidad & Tobago
The former Fifa vice president and head of Concacaf was a dominant force in football for 30 years, but was suspended from his roles in 2011 amid accusations of corruption dating back to the 1980s and an investigation by Fifa's ethics committee. He later resigned, ending the proceedings against him. Daryan Warner, the son of Jack Warner is also believed to have co-operated with the FBI. He pleaded guiltyin October 2013 to wire fraud conspiracy, money laundering conspiracy and the structuring of financial transactions, forfeiting $1.1m. Daryll Warner, another of Jack Warner's sons, he pleaded guilty to various offences in July 2013. A former Fifa development officer, he lost the job in 2012 after his father's resignation amid corruption allegations. He and his brother both face up to 10 years in prison
4/14 Charles Blazer, 70, USA
The former Concacaf general secretary reportedly turned "supergrass" to help the FBI inestigation, using a bugging device hidden inside a key fob to record meetigs with his Fifa colleagues at the London 2012 Olympics. In November 2013 he pleaded guilty to racketeering conspiracy, wire fraud conspiracy, money laundering conspiracy, and income tax evasion. Seriously ill with colon cancer
5/14 Rafael Esquivel, 68, Venezuela
Executive committee member of the South American Football Confederetion (Conmebol). It is alleged that officials at Conmebol, which organises the Copa America, received bribes from marketing executives
6/14 Eugenio Figueredo, 83, USA/Uruguay
The Fifa vice president and executive committee member is a big name in world football, having previously been at the head of Conmebol and the Uruguayan Football Association. A former right-back
7/14 Nicolas Leoz, 86, Paraguay
A former Fifa executive committee member and Conmebol president. When he retired in 2013 for health reasons, he said: "I've not stolen so much as a cent"
8/14 Eduardo Li, 56, Costa Rica
President of the Costa Rican Football Federation. He was elected to Fifa's executive commitee in March
9/14 José Maria Marin, 83, Brazil
The former president of the Brazilian Football Confederation is also a member of Fifa's committee for Olympic tournaments
10/14 Julio Rocha, 64, Nicaragua
Fifa development officer. Previously president of his country's football federation
11/14 José Hawilla, 71, Brazil
The owner and founder of the Traffic Group, a sports marketing conglomerate, pleaded guilty to racketeering conspiracy, wire fraud conspiracy, and money laundering conspiracy in 2014. Two of his companies - Traffic Sports International Inc and Traffic Sports USA Inc - have also pleaded guilty
12/14 Aaron Davidson, 44, USA
President of Traffic Sports USA, is a large promoter of football events in America
13/14 Alejandro Burzaco, 50, (pictured), Hugo Jinkis, 70 and Mariano Jinkis, 40, Argentina
Alejandro Burzaco, a media executive who controls Torneos y Competencias, a sports marketing business. Hugo Jinkis, is the president of Full Play Group, a sports marketing business in Argentina. His son Mariano, is vice president
14/14 José Margulies (AKA José Lazaro), 75, Brazil
Although he is in broadcasting, it is alleged he served as an intermediary to facilitate illicit payments between sports marketing executives and Fifa officials
Visa's statement, the sternest from Fifa's main sponsors, called on the organisation to "take swift and immediate steps to address these issues within its organisation".
It said: "Our sponsorship has always focused on supporting the teams, enabling a great fan experience, and inspiring communities to come together and celebrate the spirit of competition and personal achievement – and it is important that Fifa makes changes now, so that the focus remain on these going forward.
"Should Fifa fail to do so, we have informed them that we will reassess our sponsorship."
Coca-Cola said the corruption scandal had "tarnished the mission and ideals" of the World Cup, revenues from which account for more than 90 per cent of Fifa's funding.
It said: "This lengthy controversy has tarnished the mission and ideals of the Fifa World Cup and we have repeatedly expressed our concerns about these serious allegations. We expect Fifa to continue to address these issues thoroughly."
Adidas said it was "fully committed to creating a culture that promotes the highest standards of ethics and compliance, and we expect the same from our partners".
"Following [yesterday's] news, we can therefore only encourage Fifa to continue to establish and follow transparent compliance standards in everything they do."
McDonald's, one of Fifa's key second-tier sponsors, said it was already in contact with the organisation and that it "takes matters of ethics and corruption very seriously and the news from the US Department of Justice is extremely concerning".
Hyundai, Budweiser, Gazprom and Sony
Other key sponsors Hyundai, Budweiser and Gazprom are yet to issue statements on the scandal, while Sony announced towards the end of last year that it would not be renewing its deal after eight years as a sponsor - during which it paid out around $280 million.Reuse content