Chile have demanded FIFA investigate allegations that World Cup qualification rivals Ecuador used an ineligible player during their successful campaign.

A statement from the Federacion de Futbol de Chile outlined their belief that right back Byron Castillo was born in Colombia in 1995, not in Ecuador in 1998, as had previously been thought to be the case.

Castillo made eight appearances for Ecuador in their World Cup qualifying campaign, with La Tri set to take part in the tournament in Qatar at the end of this year.

Ecuador have been drawn in Group A alongside hosts Qatar, as well as Senegal and the Netherlands.

However, Chile released a statement on Thursday detailing their allegations around Castillo and demanding an investigation from FIFA.

La Roja finished seventh in South American World Cup qualifying, just missing out on a play-off spot.

"We inform that, on May 4, through the Carlezzo Abogados studio, we sent to the FIFA Disciplinary Commission a complaint against the player Byron David Castillo Segura and the Ecuadorian Football Federation (FEF), due to the use of false birth certificate, false declaration of age and false nationality by the aforementioned player," the statement read.

"We understand, based on all the information and documents collected, that the facts are too serious and must be thoroughly investigated by FIFA.

"There are innumerable proofs that the player was born in Colombia, in the city of Tumaco, on July 25, 1995, and not on November 10, 1998, in the Ecuadorian city of General Villamil Playas.

"The investigations carried out in Ecuador, including a legal report by the National Directorate of Civil Registry, the highest authority in the matter in this country, declared the existence of inconsistencies in the birth certificate presented by the player, and reported that this document did not exist in its internal files, pointing out other weaknesses in the document, to conclude that it was possibly fraudulent.

"In addition, an investigative commission of the Ecuadorian Football Federation, aimed at clarifying the irregularities existing in the records of players before this federation, concluded that the player was Colombian.

"All that, obviously, was fully known to the FEF. The world of football cannot close its eyes to so many tests. The practice of serious and conscious irregularities in the registration of players cannot be accepted, especially when we talk about a world competition. There must be fair play on and off the pitch."