Lionel Messi usually waits until after the match to exchange shirts but American sport stars are not taking any chances amid concerns he could miss Saturday 's game in Washington . The Argentina forward , who sat out training on Friday due to a foot problem , has already picked up three jerseys in the US capital , where Argentina are due to play a friendly against El Salvador in front of 50,000 fans at FedEx Field . Lionel Messi was forced to watch from the sidelines as Argentina held a training session on Friday . The Argentina star cut a lonely figure as his team-mates took part in training session at FedEx Field . Messi picked up the foot injury during Barcelona 's 2-1 win over Real Madrid on Sunday . Messi had been expected to feature in Saturday 's friendly after a scan cleared him to play . First up fittingly was a Wizards shirt after the four-time World Player of the Year joined his team-mates to watch Wednesday 's NBA clash against Indiana Pacers . Then Messi was presented with No 10 jerseys on Friday by Redskins quarterback Robert Griffin III and Capitals forward Alex Ovechkin . ' I 'm a big fan , and my wife loves soccer - or football , ' Griffin told CSNwashington.com . 'We follow [ soccer ] all the time and follow the World Cup . I do keep track on these guys , from Messi to Ronaldinho to [ Cristiano ] Ronaldo . It really is great fun to watch them excel at a sport that I never got to play organised . ' The pair watched the Argentina players take part in a training session before meeting Messi the locker room . 'My friend taught me a phrase [ in Spanish ] , ' Griffin added . ' I was able to say that to him when I met him . He giggled and said thank you . '
Barcelona forward Messi was injured during El Clasico on Sunday . Argentina star is in Washington for Saturday 's friendly against El Salvador . Messi sat out training on Friday despite an earlier scan clearing him to play .