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Every nation is allowed three players over the age of 23 at the Olympics.
Brazil have chosen Porto striker Hulk, as well as defenders Marcelo and Thiago Silva as the team's three over-age selections.
Hulk (pictured) is considered the star inclusion in the side, with the 25-year-old's experience and skills sure to be a valuable asset to the Brazilian team.
He has netted three goals for the senior side since 2009.
Brazil coach Mano Menezes said of Hulk (via the BBC): "He brings a lot of strength to the team. His experience will be important in big matches, as well as his great ability to be decisive."
Marcelo (Real Madrid)
Marcelo had a strong season with club side Real Madrid. The left-back finished with the club's fifth-highest average match rating for the season, according to WhoScored.com.
The 24-year-old also led the club in interceptions in 2011-12 and will be a great inclusion in the Brazilian defense.
Thiago Silva (AC Milan)
Thiago Silva is the veteran of the Olympic team, aged 27, and will provide excellent leadership and direction from the back throughout the campaign.
According to WhoScored.com, Silva finished with the second-highest average match rating last season for AC Milan. He led the club in interceptions, clearances, average passes per game and passing completion percentage.