RTE's new legal drama Striking Out, starring Amy Huberman.
"The Irish acting world is so small that everyone kind of knows everyone."
Amy and Rory worked together on RTE's GAA drama series On Home Ground back in 2001, which is where the pair first met.
They also worked together on The Clinic, which was Amy's first major TV role, playing the part of receptionist Daisy Callaghan.
Speaking recently, Keenan said that he "had a laugh" reconnecting with Amy on Striking Out, given that they used to know each other from previous projects.
He said that it was great to catch up with her again as the pair spent last summer filming the four-part Sunday night drama series.
"I hadn't seen her in a long time. I've been living in London for the last seven years so I wouldn't have seen her out and about much. It was really good to reconnect and have a laugh, and it was a laugh", he told RTE Entertainment.
Actress and author Amy is winning plaudits for her role playing betrayed solicitor Tara Rafferty in the new RTE series. Hitting all the right notes with viewers, the first episode attracted 464,000 viewers, rising to 544,000 for the second show.
There's lots more drama in store on tomorrow night's show, which sees new character Barry O'Brien in hospital with acute liver failure.
Tension also escalates between Tara and Eric as things turn personal in the courtroom. Things also come to a head between Tara and her meddling mother Irene, played so convincingly by the talented Ingrid Craigie.
They meet in a bid to clear the air but, after a few barbed comments, a frustrated Tara finally lets rip at her mother over her infuriating ways.