Ireland head coach Joe Schmidt is under no illusions about the challenge that lies ahead in their quarter-final clash on Sunday.
Ireland's win over France on Sunday earned them top spot in Pool D and a last eight clash against Argentina.
Los Pumas have proved their worth in 2015, earning their first win over South Africa during the Rugby Championship in Durban.
"We know that the physicality, the skills and the speed of the Argentineans is going to challenge us massively," said the former Leinster coach.
"Their set-piece is going to be a challenge and for us, really to be honest, this [France game] was a bit of an end point. We haven’t done too much work on looking ahead because we didn't know who we were going to be playing.
"I think the biggest attraction for us in playing Argentina was the the seven-day turnaround, not because we want to play them. I think they've been incredibly good, not just since the Rugby World Cup started but I had a very good look at their win in Durban."
Schmidt also heaped praise on Argentina for having the measure of New Zealand during their opening match, with the defending world champions only grabbing the lead in the second-half.
"They maybe should have been a few points further ahead at half time against the All Blacks in the first round of their pool and that didn't work out for them at the end, but they put the All Blacks under an immense amount of pressure," added Schmidt.
Ireland will face Argentina in the third quarter-final of the weekend at the Millennium Stadium in Cardiff.