Everton have been referred to an independent commission by the Premier League over an alleged breach of financial fair play rules.
The Premier League did not reveal the specifics of the club's alleged breach, other than saying it occurred in the period ending with the 2021-22 season.
However, Everton have posted financial losses in several recent seasons.
The Toffees denied wrongdoing and said they were "prepared to robustly defend" their position.
In their statement, Everton added: "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.
"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."
In March 2022, Everton announced losses of 120.9m for the 2020-21 season.
That meant losses over a period of three years totalled 372m - more than three times the 105m permitted under Premier League rules.
