Just ten days ago, Jordi Murphy was sitting in the Aviva Stadium looking out as hundreds of kids from all over the country got to run out on the hallowed turf at a minis event. 

Unlucky not to make the 31-man squad, he had just watched his team-mates hammer Scotland. Man, did he want to be in Japan. 

But he knows the game and perhaps more than most knows the price that back row players pay, having suffered an ACL injury in Ireland's famous win over New Zealand in Chicago in 2016. 

It's a war of attrition and knowing he was first on the standby list he was just getting on with it. 

"Joe said just keep the head down and keep working away and that's what I'm doing," he told RTE Sport. 

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Murphy was named to start for Ulster against Ospreys last Friday but was a late withdrawal. Speculation mounted that Jack Conan's foot injury was worse than first feared. 

The Leinster back row was due to start against Japan but in came Peter O'Mahony. 

The IRFU didn't confirm that Murphy was on his way until the day of his arrival, last Sunday, but now the Dubliner will make his second appearance at a World Cup when he lines up against Russia on Thursday morning at number 8. 

"He trained unbelievably well [yesterday]," said Schmidt.

"He is straight off the flight, he got in late Sunday so he's at least had a couple of nights. He was feeling good yesterday.

"One of the things is that it's a [7.15pm] game. That's around midday [11.15am] in Irish terms, so he doesn't have to recalibrate himself too much to get out and play the game, hopefully.

"We'll give him the weekend then after that.

"So we are just asking for him to do the best he can for us. The one thing with Jordi is that you seldom get anything other than that.

"He's a really good performer for us and we'd have a lot of confidence about him being able to slot straight in."

An unfortunate injury and the need to give the likes of CJ Stander and Josh van der Flier a rest has opened the door for Murphy and he may just feel he has a point to prove. 

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Follow Ireland v Russia on Thursday (kick-off 11.15am) via the live blog on RTÉ.ie/Sport and the News  Now App, watch live on RTÉ2 from 10.30am or listen to live match commentary on RTÉ Radio 1 from 11am.