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 flanker James Haskell insists he will be pushing as hard as possible to be back from a toe injury in time to make his case for a spot in Eddie Jones' side looking to defend their RBS 6 Nations title next year.