Big show, big names - RTÉ's flagship midweek radio sports show is doubling in size and adding two special new presenters for good measure.

From this evening, Donncha O'Callaghan and Ruby Walsh will be joining Marie Crowe in presenting Game On on RTÉ 2FM weekdays from 6pm.

The programme will now be extended to two hours, from 6-8pm to bring listeners more voices, views and action from the world of sport..

On their debut this evening, Dublin All-Star and five-in-a-row winner, Jack McCaffrey will be live in studio fresh from his team’s homecoming yesterday in Merrion Square. 

The programme will also feature Cork hurler Patrick Horgan on the county’s new managerial appointments. In addition, Donncha will be catching up with Republic of Ireland manager Mick McCarthy tomorrow evening.

Former British & Irish Lion, Donncha O’Callaghan won 94 Ireland caps including three Triple Crowns and was part of the 2009 Grand Slam-winning team and won two Heineken Cups with Munster.

Ruby Walsh is a 12-time Champion Jockey - riding more than 2,500 winners in his career. The two will join RTÉ sports journalist Marie Crowe, a Game On regular, as part of a new line up. 

Group Head of RTÉ Sport, Declan McBennett said; "Ruby and Donncha bring an insight that only comes with elite athletes who have a successful track record. We believe that they can transfer that knowledge and insight to listeners in a manner that enhances our sporting coverage for a sports mad nation."