Football League chairman Brian Mawhinney has confirmed receipt of a High Court writ from Leeds, who hope to get their 15-point deduction in Coca-Cola League One overturned.
Leeds this week urged the High Court to judge on their appeal against their points penalty for breaking competition rules on insolvency before the end of the current season.
The club's chairman Ken Bates placed the club in administration last May and after being handed an initial automatic 10-point deduction, the club were then hit by a further 15-point penalty the following August - to apply this season - for failing to adhere to the League's insolvency rules.
Leeds signed a written agreement at the time preventing either party from taking future legal action against the other, but Bates has since said the document had been accepted by the club "under duress".
Bates added: "In that situation, we either signed the document or we let ourselves be booted out of the League.
"But European Union law says Person A cannot prevent Person B from going to court if it's to right a wrongful decision."