Tottenham boss Andre Villas-Boas was at Brazil Olympics training yesterday.
Brazil are training at Arsenal's HQ in London Colney and AVB made the trip to see them in action, says Globoesporte.
Among the players on show are Porto star Hulk - a transfer target for Villas-Boas.
Asked about his player Sandro, the coach joked: "He's training at the home of our enemy (Arsenal)!"