The firm has denied claims that Konami has taken over all operational and business aspects of the Yu-Gi-Oh game and confirmed it is still sole and exclusive distributor for the product.
The statement from Upper Deck this morning said: "Upper Deck wishes to point out with great emphasis that the aforementioned reports are false, there is no legal ground or justification for this termination by Konami whatsoever and that this termination is therefore wrongful.
"Regarding the Yu-Gi-Oh! trading card game business Upper Deck is still the sole and exclusive distributor for the European territory and will continue providing the Yu-Gi-Oh! trading card game products to all its contractual customers.
"Upper Deck has already sent a warning letter to Konami demanding that Konami ceases the broadcasting of this misleading and unlawful information and to rectify accordingly forthwith. If Konami does not voluntarily comply with said warning, Upper Deck shall take all necessary legal actions forthwith.
"Based on the foregoing, Upper Deck will continue to conduct business with all its counterparties as usual."