And, whether he features from the start or off the bench, Murphy is eager to ensure the lineout prowess of Munster man O'Mahony is not sorely missed in Cardiff.
"It has been tough," said the 24-year-old. "It's disappointing when they name the team and you're not in it but I was always saying that my main role was to get to the World Cup and from there, it was to play well.
"It's just one of those things you have to take on the chin. They've gone with other selections and you've got to put your disappointment and frustration aside and just work on for the collective.
"I have got to support the boys straight away and do everything I can to make them be the best team they can be on the weekend and train as hard as possible.
"I've worked very hard on my lineout in the last few months. I think it's one of the things that I would have tried to emulate from Peter when I was running at six and playing there earlier on in games and in pre-season games.
"It's definitely one of the things that he brings to the squad, that explosivity in the air, his quick read time. I suppose I've been trying to learn from him in the last while and if I get a go, hopefully I'll be able to do it justice."
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