Colombia's national teams footballers jog during a training session
Argentina's forward Lionel Messi (L) bites his nails next to forward Sergio Aguero after a training
Uruguay's Sebastian Abreu (R) during a training session
Peru's football team players Juan Vargas(R) and Paolo Guerrero(L) joke during a training session
Paraguayan footballers Salustiano Candia, Claudio Vargas, Nelson Haedo Valdes and Ariel Nunez warm up during a training session
Argentina's coach Alejandro Sabella (R) talks to midfielder Javier Mascherano (C) and midfielder Pablo Ginazu during a training session
The coach of Ecuador's national football team, Colombian Reinaldo Rueda, smiles during a training session
Bolivia's national football players Jhasmani Campos (L) and Alejandro Chumacero make exercises during a training session
The coach of Bolivia's national football team, Spaniard Xabier Azcargorta (C) gives directions to the players during a training session
