Images on social media showed players from neighbouring clubs, Fuerty and Creggs, togging out in the hall which is usually reserved for election counts or occasional functions.
It is understood that the dressing rooms on the Athlone Road side of the county ground were out of commission last weekend due to unforeseen circumstances.
In a statement to the Roscommon People this week, Roscommon GAA said: “Roscommon GAA is aware of the situation that arose regarding the allocation of dressing rooms at Dr. Hyde Park on Sunday. We would like to sincerely apologise to the clubs who were affected. We will ensure that this will not happen again in the future”.