Ryan Tubridy and his agent Noel Kelly have offered to appear before the Oireachtas Media Committee next week.
Solicitors for the pair have written a letter to committee Chair Niamh Smyth, stating they wish to "fully cooperate and assist" with investigations.
It comes in the wake of fresh revelations at RTÉ that several barter accounts were in existence, despite the executive board stating last week there was only one.