Juan Martin Hernandez believes Argentina can prove Ireland's World Cup scourge once more in a fourth "El Clasico".
Argentina's classy centre Hernandez hailed facing Ireland as a derby to rank right up there with the fierce rivalry on show whenever Barcelona face Real Madrid in football.
The 33-year-old insists the Pumas can dump Ireland out of a third World Cup in Sunday's quarter-final in Cardiff, after eliminating the same foes in 1999 and 2007.
Now Hernandez believes the Pumas can dish out more misery on the Irish.
"I remember in 1999 when we went through to the quarter-finals for the first time," said Hernandez of Argentina's 28-24 victory in Lens.
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"I was not part of the team then, I was very young but I remember watching on TV.
"These games are like El Clasico, they are derbies.
"I know Ireland has European teams but for us it has become a nice challenge, a great derby."
Argentina have produced some of the World Cup's most compelling attacking rugby, but Hernandez knows the challenge cranks up a notch against Ireland.
Hernandez, nicknamed 'El Mago' the magician, will trade Toulon for Argentina's new Super Rugby franchise after the World Cup.
The 33-year-old relishes the three World Cup matches in history between Argentina and Ireland, with the Pumas triumphing 30-15 in 2007.
Self-assured pivot Hernandez believes former Racing Metro teammate Johnny Sexton will be crucial to Ireland's chances at the Millennium Stadium.
Sexton is battling to beat a groin problem in time for Sunday's match, with Ireland ready to gamble on his fitness if he is not quite 100 per cent.
"He's the one that has the tempo of the team, when they run, when they play, when they kick, everything," he said.
"I think he's key to their detail."
