Gold medal favourites Brazil suffered their first Olympic Games setback on Tuesday when first-choice goalkeeper Rafael Cabral was ruled out of the tournament with an elbow injury.
The 22-year-old Santos player picked up the injury to his right elbow during a training session at Arsenal's London Colney training ground on Monday and has flown home to receive treatment.
Cabral started in Brazil's 2-0 friendly win over Great Britain at the Riverside Stadium in Middlesbrough on Friday.
Brazil coach Mano Menezes is expected to confirm Cabral's replacement later on Tuesday.
The South American giants begin their Olympic campaign on Thursday against Egypt in Cardiff.