Ireland assistant coach Les Kiss (below) believes Argentina have been strengthened by their exposure to the Rugby Championship.
The Irish are targeting a third successive victory over the Pumas when the rivals clash in the climax to the Guinness Series at Aviva Stadium today.
This year, Argentina competed in an annual tournament for the first time after appearing in the successor to the Tri-Nations and Kiss recognises the advantages that has brought.
"They're a team you must have a massive amount of respect for. It will be a physical affair," he said.
"They beat Wales well two weeks ago and have benefited from playing in the Rugby Championship.
"You can't afford to disregard what they've learned from being involved in it."
Carter out of Cardiff clash
Dan Carter has been ruled out of the New Zealand team for today's Test match against Wales in Cardiff.
Fly-half Carter will be replaced by Aaron Cruden, with Beauden Barrett joining the replacements' bench. Carter, who has won 93 caps, suffered a leg injury during All Blacks training at the University of Glamorgan yesterday.
In nine appearances against Wales he has scored 162 points and never been on the losing side.
The 30-year-old's injury is believed to be Achilles-related.
Cruden, 23, has won 18 caps, and he has yet to taste defeat in an All-Blacks shirt.
Wales v New Zealand 5.15 (BBC2)
England can be best: Brits
South Africa hooker Schalk Brits knows the English game better than any other Springbok and believes Stuart Lancaster's young side will grow into the best England team of all time.
The 31-year-old hooker has consistently been one of the outstanding players in the Aviva Premiership since his move to Saracens in 2009, and he believes the Springboks will today face an England team on the path to greatness.
Brits said: "They have the right coaches, the right set-up and very good players. This England squad can be the best ever. They can match the 2003 squad. I think the 2015 World Cup is realistic."
England v Sth Africa 2.30 (Sky Sports 1)