Confederation of African Football (CAF) president, Ahmad Ahmad is coming under growing pressure as FIFA investigates allegations against him.
Mr Ahmad, who took charge of African football in March 2017, is currently being investigated by both FIFA's Ethics Committee and by French anti-corruption authorities - with an unusual kit deal involving a French gym equipment supplier among the lines of inquiry.
The 59-year-old from Madagascar, whose organisation is currently hosting the Africa Cup of Nations in Egypt, has strenuously denied any wrongdoing in previous statements.
In early June 2018, Mr Ahmad traveled to Moscow to attend both the FIFA Congress on June 13 and the World Cup, which ran between June 14 and July 11.
Documents seen by the BBC indicate that Mr Ahmad flew from Russia to Egypt on June 23 for a four-day stay before heading back to Moscow after a trip home to Madagascar between June 27 and July 1.
Nonetheless, the documents suggest that, on September 28 last year, Mr Ahmad collected $18,450 from CAF for a 41-day stay in Russia between June 7 and July 17.
His signature can be seen at the bottom of a page detailing the expenses, which came under the heading 'Mission: World Cup Russia 2018.'
As a vice-president of football's world governing body, Mr Ahmad should have been paid his daily World Cup allowance of $450 by FIFA since they organise the tournament -- meaning he may have received three sets of payments for the nine-day spell in question.
"President Ahmad took contact with the FIFA administration to support him in its action for CAF's reforms and to get the process more transparent," CAF replied to BBC Sport in a statement.
"The details of this cooperation will be announced very soon. For now, as the President have a very deep respect of the institutions, he keeps his answers for FIFA's teams, which will lead the future audit."
In June, FIFA and CAF announced that the former will install its own Secretary General to oversee administrative reform in the governance of African football's ruling body from 1 August.
The decision to appoint Senegalese Fatma Samoura as a General Delegate to CAF is unprecedented in the 115-year history of FIFA, which has never had recourse before to help guide the administration of a confederation.