The Premier League has referred Everton to an independent commission for an alleged breach of Financial Fair Play rules last season, it said on Friday without giving further details.
Everton said in a statement the club was disappointed by the decision.
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"The club strongly contests the allegation of non-compliance and together with its independent team of experts is entirely confident that it remains compliant with all financial rules and regulations," it said.
"Everton is prepared to robustly defend its position to the commission.
"The club has, over several years, provided information to the Premier League in an open and transparent manner and has consciously chosen to act with the utmost good faith at all times."
Everton narrowly avoided relegation from the league last season, finishing 16th. They are again fighting to stay up this season and are 15th in the table, just three points clear of bottom side Southampton.
Under Premier League rules, teams can make a maximum loss of £105 million ($128.28m) over three years, although special allowances were made for the COVID-19 pandemic.
Everton have recorded a total loss of nearly £372m in the past three seasons.
The club, majority owned by Farhad Moshiri, has attributed at least £170m of that to the impact of the pandemic.