TIMELINE: FIFA Controversy

Outgoing FIFA president Sepp Blatter is reportedly being investigated by US prosecutors and the Federal Bureau of Investigation.

On Tuesday, Blatter unexpectedly said he would step down as FIFA president in the wake of a corruption investigation that has rocked world soccer.

The New York Times, ABC News and Reuters news agency are reporting that they have been told by an unnamed source that prosecutors are investigating Blatter.

Blatter’s announcement came a week after several FIFA officials were arrested in Zurich on bribery and corruption charges.

US Attorney General Loretta Lynch declined to comment at a press conference on Wednesday on whether Blatter was under investigation as part of a probe by US authorities into the soccer organisation.

"With respect to the FIFA investigation as was announced last week we are not able to comment further on the nature of other individuals who may or may not be under investigation," Lynch said in the capital of Latvia.

"This is an ongoing matter, it is an open case, and so we will now be speaking through the courts."

Asked if anything had been discovered that would connect suspicious payments with the planned world cups in Russia in 2018 and Qatar in 2022, Lynch said: "The Swiss authorities do have an investigation underway and their investigation covers matters involving the World Cup awarding for 2018 and 2022, and beyond that I am not able to comment."

Some of FIFA's biggest corporate sponsors including Coca Cola, McDonalds and Visa have welcomed his decision.

Visa said it was a significant first step towards rebuilding public trust.

Blatter daughter told a Swiss newspaper on Wednesday her father's decision to stand down is not tied to recent allegations.

"His decision has nothing, absolutely nothing, to do with the allegations going around," Corinne Blatter-Andenmatten is quoted as saying by Swiss daily Blick. 

Meanwhile, UEFA has scrapped a meeting planned for Saturday at which they had been due to discuss their next steps following last week's FIFA presidential election, UEFA president Michel Platini said in a statement on Wednesday.

"I have decided that it would be more appropriate to postpone the meeting which could have taken place in Berlin this weekend," Platini said.

"Considering new information is revealed every day, I believe it is wiser to take time to assess the situation, so together we can take a position on this issue."