Sepp Blatter has been told to stand by his resignation as president of FIFA.
Blatter initially said that he was resigning but he has since hinted that he might not step down.
"The times of flirting with the power are definitely gone," Domenico Scala, the independent chairman of FIFA's audit and compliance committee, told reporters.
"I call on all concerned - including Mr Blatter - to endorse in the interest of the reforms unequivocally the announced changing of the guard at the top of FIFA."
Blatter has been FIFA president since 1998.
