Ireland kicked off their summer travels with a 29-17 win in Argentina on Saturday but Paul O'Connell insists performances must improve as the month goes on.
The reigning RBS 6 Nations champions edged to victory over the Pumas through tries from Chris Henry, Jonathan Sexton and Andrew Trimble - Sexton also added eight points from the tee while Ian Madigan kicked two penalties.
It was the Men in Green's first outing since waving farewell to Brian O'Driscoll with a nail-biting RBS 6 Nations triumph in March.
And O'Connell - now the squad's elder statesman in O'Driscoll's absence - believes they must kick on when the two sides meet again on Saturday.
"They put us under a lot of pressure, I think the result is great but the performance is disappointing," he said.
"We didn't know we were going to be as inaccurate as we were. We put a lot of balls down and missed some tackles.
"They had some very big men, some really good footwork and they put us under a lot of pressure and it kind of thrived off our mistakes, we were unlucky not to score a try early in the first-half. And 30 seconds later we were lucky not to concede a try.
"So that's kind of the way they play and we knew that but I suppose we were intent on trying to stop that and we didn't do that."
England Under-20s may have agonisingly missed out on a third straight World Rugby U20 Championship title on Saturday but head coach Jon Callard is adamant that fans are witnessing the next generation of international superstars.
Italy Under-20s held off a late Samoa blitz to retain their place in the World Rugby U20 Championship on Saturday and head coach Alessandro Troncon believes the experience will have served as a valuable lesson for his young troops.