Barcelona striker Lionel Messi [Images] and Atletico Madrid forward Sergio Aguero have been included in Argentina's squad for the Beijing [Images] Olympics [Images] soccer tournament.

Former Barcelona and Villarreal midfielder Juan Roman Riquelme, now with Boca Juniors, was also included by the champions as an over-age player.

Messi has already said that he is torn between playing for Argentina and Barcelona in August.

Coach Sergio Batista's 18-man squad named on Wednesday also included Inter Milan defender Nicolas Burdisso, Real Madrid [Images] midfielder Fernando Gago and Liverpool's Javier Mascherano.

Argentina face Serbia, Australia and Ivory Coast in their first-round group.

The Olympic soccer tournament is limited to under-23 teams, with three over-age players allowed per side.

Goalkeepers: Oscar Ustari (Getafe), Sergio Romero (AZ Alkmaar)

Defenders: Pablo Zabaleta (Espanyol), Luciano Monzon (Boca Juniors), Ezequiel Garay (Real Madrid), Nicolas Burdisso (Inter Milan), Federico Fazio (Sevilla), Lautaro Acosta (Sevilla)

Midfielders: Fernando Gago (Real Madrid), Juan Roman Riquelme (Boca Juniors), Ever Banega (Valencia), Javier Mascherano (Liverpool), Jose Sosa (Bayern Munich)

Forwards: Diego Buonanotte (River Plate), Sergio Aguero (Atletico Madrid), Lionel Messi (Barcelona), Ezequiel Lavezzi (Napoli), Angel Di Maria (Benfica)