Brendan Coyle plays Jeremy a middle class gynaecologist who ended up in prison for drink driving, while McElhatton takes on the part of Rats an unemployed part-time musician, poet and habitual offender.
The 60-year-old, who won an IFTA award for Best Actor in a Television Drama for his role in 2002, reckons it would be interesting to look at his character "in a different format".
"I'm always thinking about it. Maybe we could look at him in a different format - never say never!"
"I adore him and frequently do him myself at home. It's quite comforting," he said.
"He is a pseudo-intellectual. He's a little bit of a charlatan which we find out further down the line. Initially, he does ruffle a lot of feathers. He comes in and makes the house his own and Tom [Ciarán Hinds] is relegated to the shed outside. The children aren't too impressed with him!"
The Terenure actor explained how is character is "an opportunist" and admits he wouldn't like to sit next to him at a dinner party.
"He's an utter cynic really. We discover that he's just looking for a free gaff and while he does have a great relationship with Bernie, he's an opportunist and he's hiding behind his sobriety, and what he thinks is high standing in AA and academia - but it's all pseudo," he said.
"Would I like him as a person? No! But he was a lot of fun to play," he laughs.
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