Springboks and Pumas confirmed for autumn Tests
Ireland will play South Africa, Argentina and a yet to be announced tier-two nation in next year's autumn internationals.
Ireland last played the Springboks in June, when they secured a first ever win on South African soil, before losing the final two Tests of the series.
The clash with the Pumas will be the first meeting between the sides since last year's World Cup quarter-final at the Millennium Stadium, where Argentina defeated an Ireland team laden with injury.
The fixtures are likely to take place between the second and fourth Saturdays of next November, which will be the 11th, 18th and 25th.
Elsewhere, having recovered from a foot injury sustained during Ireland's win over Australia, Andrew Trimble will be available for Ulster for Friday's Pro12 clash with Connacht at Kingspan Stadium.
However, prop Kyle McCall will miss the tie after suffering a hamstring injury in the Champions Cup loss to Clermont, as will lock Pete Brown, who was concussed in the same game.
Meanwhile, Warren Gatland has insisted that he will not be leaving his post as Wales head coach and returning to work in his native New Zealand following the Lions tour there.
Gatland is contracted to the WRU until after the 2019 World Cup. The 53-year-old did reveal that the Waikato Chiefs had approached him, but he told the Super Rugby franchise he was not interested in the job.
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"The Chiefs spoke to me about three months ago but I told them it was a non-starter until my contract runs out with Wales," Gatland said.
"I told the Chiefs I would be interested after 2019 but there's no way I would leave Wales or the Lions now.
"All my focus is on is the Lions and Wales. I repeat: I'm not going anywhere until after the 2019 World Cup."