Argentina head coach Marcelo Loffreda is wary of Chris Paterson's kicking threat ahead of Sunday's World Cup quarter-final meeting with Scotland.
Loffreda expects a tough match against Scotland in Paris
"To play with discipline will be very important and we have to reduce the penalties to a minimum," he said.
"We can't afford to make too many mistakes against Scotland because Paterson is infallible.
"Italy played better than them, but they were very undisciplined and they paid for that."
Paterson kicked the Scots into the last eight by nailing six penalties out of six in the 18-16 win over Italy.
And the Gloucester utility back is yet to miss in 15 attempts at the tournament.
But Loffreda, whose side beat France and Ireland to secure top spot in Pool D, is not writing Scotland off as a one-man team.
"It's very wrong to think Scotland are just a kicker and 14 players behind him," he added.
"Our match against Scotland will be even more difficult than the one we played against Ireland.
"Scotland have a great running game, they are very fast, and they have a strong pack of forwards. On top of that, they have a great kicker.
"I think Scotland will prepare a very tactical match. They will want to play in our territory.
"We are going to have to respond to that by playing a good kicking game."
Argentina captain Agustin Pichot is also anticipating a close encounter with the Scots at the Stade de France, Paris.
Pichot helped Argentina knock Ireland out of the World Cup
The in-form Pumas are ranked fourth in the world - four places ahead of the Scots.
But Pichot said: "I never take statistics or rankings. I don't like them and don't think they are true.
"We can't afford to think we are better than anyone. We have to play at a very high level for 80 minutes, especially against a team like Scotland."
Scotland, who just edged out Italy to qualify from a group won comfortably by New Zealand, have lost their last five meetings with the Pumas.
Indeed, Argentina last lost to the Scots 17 years ago, when Tony Stanger and Kenny Milne scored two tries each in a 49-3 win at Murrayfield.
"Even though we may come in ranked higher than Scotland, Scotland proved they are in the best eight teams," stressed Pichot.
"When the competition started, they were written off and so were we. They are in the same position as us."