Warner has been suspended from all football-related activity pending an inquiry into bribery allegations but has been reported for breaching the terms of that ban.
Chuck Blazer, the USA FIFA member who blew the whistle on the bribery claims, said the CONCACAF president had still been getting involved in the business of the confederation.
Blazer said Warner had been meeting associations and that a statement from acting CONCACAF president Lisle Austin had come from Warner's aide.
Blazer told Press Association Sport: "We have clear evidence of a violation of his suspension and we have reported that to the FIFA secretary general Jerome Valcke.
He added: "He has also been meeting with [CONCACAF] members, which is against the rules of the suspension."
Two more of FIFA's key sponsors have increased the pressure on the world governing body to resolve the crisis that is enveloping them.
Credit card giant Visa and their fellow leading corporate backer Emirates today joined Coca-Cola and adidas in expressing concern at the continuing controversy at the top level of the game's administration.
The crisis has also seen the Football Association and their Scottish counterparts call for FIFA's presidential election on Wednesday to be postponed.
A Visa spokesperson said: "The current situation is clearly not good for the game and we ask that FIFA take all necessary steps to resolve the concerns that have been raised."