The 61-year-old calls on the Albiceleste squad to start playing more dynamic football and expects that their last group game against Nigeria will be a tough test
Alejandro Sabella's team have qualified for the knockout round of the tournament in Brazil after back-to-back wins against Bosnia-Herzegovina and Iran.
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"The good news is that Argentina have qualified for the second round after only two games and that Lionel Messi is looking brilliant," the World Cup winner told The Times of India.
"The bad news is that Argentina are not playing as a team. That is very, very worrying, to be perfectly honest. If we don't improve, we are going have a problem in the second round.
"At the moment Argentina is like a car in first gear and we need to get into second quickly. There are some wonderful players who have so far not done much - like [Gonzalo] Higuain, [Sergio] Aguero and [Angel] Di Maria.
"Aguero, for example, had a brilliant season for Manchester City and was one of their main players along with Yaya Toure. I would say the team is not helping them play well."
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"Our counterattacks need to be much quicker too. We are too slow to react between winning the ball and attacking."
Argentina require a draw against second-placed Nigeria to top Group F when the two teams meet in Porto Alegre on Wednesday – a game that Ardiles thinks will be a tough test for the Albiceleste.
"Nigeria did not have a good game against Iran but were so much better against Bosnia," he observed. "It is going to be tough and Argentina will have to be on top of their game if they want to win the group."