Fast food chain Supermacs is calling for answers from Galway GAA about how it spent almost €1.6 million euro in sponsorship money.
It's broken down five years of payments in a statement posted on its website tonight.
The firm says it raised financial concerns with the board four years ago.
GAA authorities and accounting firm Mazars were brought in to examine the state of the county's finances last year and a meeting in December last year heard concerns expressed over practices in the period of 2015-17.
The use of an official credit card for personal expenses, officer expenses of €45,000 and a debt of €390,000 to Croke Park for All-Ireland final tickets were among the revelations.
A 103-acre site in Athenry that was bought in 2006 for €2.8m and earmarked for a centre of excellence was sold at a loss of almost €2m last year.
Supermac's, founded by Galway native Pat McDonagh, has been a sponsor of at least one of the county's teams since 1991 and has now demanded clarity on where their total contributions of almost €1.6 million over the last five years have gone.