Joey Carbery will miss Ireland’s final autumn international, against Argentina on Saturday, with a fractured wrist.
The 22-year-old Leinster back was injured during the second half of the last Saturday.
And the Irish Rugby Football Union says Carbery is out of the remaining fixture of the November series.
Tight-head prop John Ryan has been recalled to the squad after recovering from the calf injury he sustained during the win over South Africa.
Carbery created Ireland’s opening try against Fiji, producing a quick sidestep before firing a pass to winger Darren Sweetnam to score, but he looked to be in some discomfort when he was helped off the pitch midway through the second half.
Head coach Joe Schmidt was impressed with the New Zealand-born playmaker’s performance in his first start at fly-half this season.
“I thought his ability to organise others is coming along,” he said. “I think that’s one of the biggest responsibilities of a number 10.
“I thought he ducked and dived and asked a few questions of the Fijian defence and he was brave, potentially to a fault, because he takes no heed of who is in front of him.”
Aside from Carbery, the rest of the players who featured against Fiji are expected to be fit to train this week as they prepare for the visit of the Pumas to Dublin.
The game will be the first meeting between the two sides since Ireland’s at the 2015 Rugby World Cup.