Diego Simeone hails Lionel Messi, Sergio Romero

Argentina's forward and captain Lionel Messi celebrates after scoring his team's second goal during the Group F football match between Argentina and Bosnia Hercegovina at the Maracana Stadium in Rio De Janeiro during the 2014 FIFA World Cup on June 15, 20
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Diego Simeone praises the performances of Argentina duo Lionel Messi and Sergio Romero in this year's World Cup.

Diego Simeone has praised the performances of Argentina duo Lionel Messi and Sergio Romero in this year's World Cup.

Messi has scored four goals for the South Americans so far, while goalkeeper Romero made a number of crucial saves during his country's 1-0 victory over Iran.

Atletico Madrid manager Simeone has been delighted with the form of each player, and believes that their displays will improve the confidence of their teammates ahead of the knockout stages.

"Lionel Messi has stepped up in the important moments to win games for Argentina at this World Cup," Simeone told Goal.com. "He is a player who offers something different to Argentina, but the team needs to grow as a unit and I'm convinced they will do that as the World Cup moves into the knockout phase.

"I was also very happy with the performance of Sergio Romero against Iran. In a World Cup, when you have a player like Messi who can win you any game, plus a goalkeeper who is growing with each match, that's very important.

"At a tournament like this one, if your goalkeeper is on form and your most decisive player is also on form, that gives you confidence at both ends of the pitch. It's a weapon all teams would like to have."

Argentina will face Switzerland in the last 16 in Sao Paulo next Tuesday.

Lionel Messi of Argentina scores his team's second goal and his second of the game during the 2014 FIFA World Cup Brazil Group F match between Nigeria and Argentina at Estadio Beira-Rio on June 25, 2014
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