Argentina's Guido Petti says the Irish climate gives Joe Schmidt's side an advantage ahead of their showdown at the Aviva Stadium on Saturday (Live on RTÉ2, 6.30pm).

Petti, who has been named to start at No 7, describes their opponents as a 'united' outfit with a strong scrum and line-out, having scored an emphatic victory over Italy in their opening game of their November Internationals.

The Pumas will be bolstered by some impressive victories in the Rugby Championship when they line out on Saturday evening, but Petti admits that they will have to get to grips with the Irish climate before taking on Joe Schmidt's charges.

"We are getting used to the climate. We know it will be a very tough match so we are looking forward to it.

"We know the climate here is a bit difficult, it's not like in Argentina or in Australia. That changes a lot for us and it's an advantage to them."

Members of the Ireland squad at training.

Petti was part of the Argentina squad who suffered a 28-19 defeat when they came to Ireland last November and has become familiar with some key Ireland players like Johnny Sexton and Iain Henderson, who are both named to start at the weekend.

"They have very good players, all of them. They have players that pay attention, they all really know what they are doing and all are very experienced. They don't have anyone that's not good so we'll have to pay attention to every player.

Argentina's Guido Petti

"They compete, they have a good scrum and good lineout. They are very united and you can see that.

"They are very clear with what they want to do so I think it's going to be a matter of who has more heart and strength to take the match."

Argentina's entire squad comes from the Jaguares club, who are currently second to the Lions team on the South African Super Rugby table.

It's an unusual dynamic for the Pumas when compared with other rugby nations including Ireland, who are powered by clubs in the four provinces.

Petti says this unique connection between the Jaguares and the national team breeds a sense of familiarity among the players which works for them.

"It's an advantage for us because we play all year together so we know each other really well and I think it makes the team more united.

"We are used to playing with each other so that's good for us."

The Argentina team after training in Dublin on Thursday

"I think we are very good, we had a very good championship. The team is very comfortable, we have very clear ideas and we know what we are playing. It will be a very good match and much better than before."

Argentina enjoyed some mixed success during the Rugby Championship campaign, coming away with a victory against South Africa at the end of August after suffering defeat to the Springboks a week earlier.

But while they got the better of Australia the first day out to end a 35-year wait for a win over the Wallabies, they lost out in the second meeting after scuppering a 24-point half-time lead.

"I think confidence is a lot and in the Rugby Championship we had up and downs maybe so we'll try to play the game we played against South Africa which was probably our best 80 minutes."

Follow Ireland v Argentina via our liveblog on RTÉ.ie/sport and the News Now app, watch live on RTÉ2 and the RTÉ Player or listen to live commentary on RTÉ Radio 1 this Saturday (kick-off 6.30pm)