No-shows from "constituent groups" were responsible for the large number of empty seats during Friday's Group A match between Uruguay and Egypt, FIFA said.
The Yekaterinburg Arena in Russia was far from capacity for the second match of the tournament.
According to the official data, the game, which ended in Uruguay's narrow 1-0 victory, was attended by 27,015 supporters, while a total of 32,278 tickets were allocated
On Saturday, the authorities of the Russian city of Yekaterinburg, which hosted the match, said that they would send a request to FIFA, who is responsible for allocating the tickets, asking to investigate the incident.
"We can confirm that the matter related to the match in Yekaterinburg was mainly linked to no-shows from all constituent groups," a FIFA spokesperson told Irish broadcaster RTE.
"There were no problems with FIFA's ticketing operations on-site that would have prevented ticket-holders from attending the match and, as already mentioned, 32,278 tickets had been allocated."
RTE said the reference to "constituent groups" was interesting given complaints that too many tickets were going to dignitaries and sponsors rather than fans.
The 2018 FIFA World Cup kicked off on Thursday and will continue until July 15, with the matches set to be played in 11 cities across Russia.
Another three group-stage games will be played at Yekaterinburg's 35,000-seater arena, with France playing Peru on June 21, Japan facing Senegal on June 24, and Mexico taking on Sweden on June 27.
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