Prop Cian Healy's march towards full match fitness will continue against Romania next Sunday.
Coach Joe Schmidt will have to decide whether that will be from the start or from the bench with Jack McGrath probably set for a back seat.
Ireland stopped the bleeding from losses to Wales and England with some sort of momentum generator against Canada.
Anyway, Schmidt will take a scalpel to his first-choice 15 and make what should be a host of changes because all of his players are intact besides, possibly, Robbie Henshaw.
"I don't think too much has changed in our thoughts, because we got through unscathed," said Schmidt.
"There will be some guys who go back out and some guys who will come in.
"And that was probably always our intention, to utilise not the full breadth, but a fair bit of the breadth of the squad in those first two matches.
"There's some guys who haven't had a lot of game time, the obvious one is Cian Healy (pictured). But there's a few other guys who could do with a bit of game time," he suggested.
The manner of Japan's shocking win over South Africa will have reminded the Irish that anything is possible.
Schmidt may move from showing his players a video of what nearly happened against Georgia in 2007 to what did happen to South Africa on Saturday evening. You underestimate anyone at your peril. Just ask Springbok coach Heyneke Meyer.
"Through these first two games, the ideal would be that they all get a bit of game time to be prepared for the back end of the pool," added Schmidt. "At the same time, we've got to be conscious that every match is going to be tough."