Plaid's Assembly candidate for Wrecsam Marc Jones has called for "transparency" and "honesty" from Wrexham Football Club's owners Geoff Moss and Ian Roberts.
He was responding to news that the Racecourse Ground had been put up as security on a loan by the Rugby Football League to the Crusaders rugby league team. The agreement between Wrexham FC (2006) Ltd and the Rugby Football League was lodged at Companies House on Christmas Eve and has only now become public thanks to research by fans.
It is not clear whether the charge on The Racecourse was a condition of the Crusaders coming out of administration.
Mr Jones said: "The owners, who have 100% control of Wrexham Village, Wrexham FC and the Crusaders, have a duty to be transparent and honest about The Racecourse.
"If there is a logical and sound reason for putting a charge on the ground, then football and rugby fans alike should know about it. If there is a danger that The Racecourse could be lost to the football club, then that is incredibly worrying.
"We should be able to concentrate on the football club pushing for promotion and the Superleague team starting a new season.
"What is concerning many people is the secrecy and lack of transparency about these dealings. I would urge the owners to make clear their intentions and to reassure people in Wrexham about The Racecourse."