Argentina defender Ezequiel Garay is wary of Bosnia-Herzegovina from set-pieces ahead of their FIFA World Cup opener.
The two sides face each other at the Maracana on Sunday as they get Group F up and running, with Argentina expected to progress comfortably into the knockout stages.
Like fellow Group F sides Iran and Nigeria, Bosnia will feel they have a very realistic chance of earning a place in the last 16.
While Argentina are the clear favourites to seal top spot in the group, Garay is concerned about Bosnia's ability from dead-ball situations, with the likes of Edin Dzeko, Vedad Ibisevic and Emir Spahic dangerous in the air.
Garay said: "It's my first World Cup. It's a dream come true.
"No match will be easy, but we are Argentina and have to go out to win.
"I'm not afraid of Dzeko, but we should not grant Bosnia corners and set-pieces. They have players with a significant height and size.
"We have a team that is very offensive and, at some points not everyone will be able to defend. Hence we (the defenders) have to gather and defend well.
"We have to have patience and handle their debut. Bosnia will play on the counter-attack."
Midfielder Lucas Biglia has spoken of Lionel Messi's influence on the squad and, while the Lazio man gave his captain notable appraisal, he insisted Argentina are not a one-man team.
"Messi is a very positive leader," he added. "He'll be showing up to all of us. He is number one.
"I wish he doesn't miss a match, but if Messi is not in a game or at his best level we have other options.
"We are a very offensive team, but that does not mean that the defence isn't tight."