It was a difficult night at the office for Ireland captain Rory Best, as a malfunctioning lineout gave Argentina a foothold in the first half.
Ireland eventually won out 28-17 to record their 10th straight home Test victory, but the captain knows improvement will be required ahead of next Saturday's meeting with the top-ranked All Blacks.
Joe Schmidt will have to plan without Sean O'Brien, who broke his right arm in the first half, but Ulster hooker Best was in no mood to seek excuses.
"We were probably a wee bit slow out of the blocks but look Argentina are a quality side and it is another win for us with some good stuff and some things we will need to get better for next week," he told RTE Sport's Clare McNamara.
"It has been a long time since this group has played together. The boys did well last week but they were a wee bit slow out of the blocks as well. Robbie dropping out in the warm-up, but we are used to all that.
"We will not look for excuses. We will look to see how we get better, how we improve and build into next week again," he added.
"We knew Argentina would be physical, they would make it very difficult for us, they would be good at the breakdown and good at the setpiece.
"It was a real challenge. There were a couple of times when the game was in the balance and we just had enough character and we got together and we made the most of the few chances that we got."