Ireland coach Eddie O'Sullivan declared himself satisfied with Brian Carney after the 30-year-old won his first cap since switching from rugby league.
Carney only made his Munster debut in March
The winger scored an early try from an intercept and played all 80 minutes in the 22-20 defeat to Argentina.
"Brian did a good job," O'Sullivan said of the former Great Britain player, who is now with Munster.
"It was an inexperienced backline and despite some mistakes, I'm happy with his performance and I told him that."
Carney is one of several players in the Irish party aiming to stake a claim for a World Cup place with the majority of the first-choice side left at home.
The sides meet again in Buenos Aires next Saturday ahead of a World Cup pool match on 30 September.
But Ulster prop Simon Best, who skippered the side in Santa Fe on Saturday, insisted the results will have little bearing on their Paris match.
"They will be very different teams because there are a lot of players missing," he said.