Leicester City Football Club’s owners have said they “categorically deny” a report that they owe £323m to the Thai government.
On Monday a court in Bangkok was reported by Reuters news agency to have accepted a lawsuit against King Power International.
However, the club and King Power say the allegations “have yet to be accepted”.
They said they would “fight rigorously” any attempts to “discredit them”.
The lawsuit accuses King Power of failing to pay the Thai government 14 billion baht (£323m) from the operation of a duty-free franchise it was awarded in 2006.
The case is also being brought against executives of state-owned Airports of Thailand, Reuters said.
A criminal court in Bangkok will now hear from witnesses next February, the news agency added.
But, Aiyawatt Srivaddhanaprabha, King Power chief executive and Leicester City vice-chairman, said the alleged charges “have yet to be accepted by the court”.
“[The allegations] are categorically denied,” he said.
“King Power has always followed and been absolutely committed to the highest standards in proper and ethical business practice.
“We are proud of our company’s good name and honest reputation and will fight rigorously any attempts to discredit them”.
The BBC has also contacted Airports of Thailand for a comment, but it is yet to respond.