Tim Vickery in South America

Olympic football may not be the main event of the Olympic Games but those teams taking part have an excellent opportunity to try things out as they prepare for the next World Cup.

This has rarely been clearer than at Old Trafford on Sunday, when 2014 hosts Brazil were confronted with a problem they will surely meet time and time again in two years' time. Opponents Belarus put 10 men behind the ball and looked to frustrate them, forcing them to pass sideways, hoping that Brazilian frustration would lead to error and then launching the counter-attack.

What made this match especially interesting was that Belarus took the lead, scoring a beautifully worked goal on almost the first occasion they crossed the halfway line. The true test of a team is always when they go a goal down. How would Brazil respond?