Leicester City have started legal proceedings against the Premier League and English Football League (EFL) after being charged with allegedly breaking spending rules.
The Championship leaders said they were "compelled to act" after being charged with breaching profit and sustainability rules (PSR) on Thursday.
If found guilty, the Foxes could face a points deduction.
The club have also been placed under a transfer embargo by the EFL.
Leicester have been referred to an independent commission by the Premier League for the alleged breach of PSR rules for their last three seasons in the top flight and for failing to submit audited finances.