26 July 2012
Last updated at 17:29
Brazil's women footballers started their 2012 Olympics campaign in Cardiff with a win on Wednesday and on Thursday, it's the men's turn when they play Egypt in a match which kicks off at 19:45 BST
Brazilians Paulo Gatto, Marinis Bigossi and Paulo Machado have travelled to the game from London and are confident of a Brazil win.
Edson Da Silva and his partner Lucy Cardoso, from London, say it is important for the Olympics to be spread around the UK.
Brazilian hats were on sale near the Millennium Stadium
Some fans posed for pictures at the giant goalposts erected outside Cardiff Castle
Brazil v Egypt is the first men's Olympic football match to be held at the Millennium Stadium
Egypt fan Mohammed Abid, 22, who is studying in Cardiff said: "I haven't seen the city so lively for quite a long time."
Henrique, 9, and Beatriz, 10, live in London but their family is originally from Sao Paulo
Fans from both sides mixed in the city centre in a friendly atmosphere
Meanwhile, Great Britain women's players Rachel Yankey, Fara Williams and Rachel Brown watched Japan v Spain on the big screen at The Hayes in Cardiff
Many more people gathered at The Hayes to watch the football and soak up the sunshine
An Egyptian fan near the stadium
Outside the stadium, fans brought a carnival atmosphere
Fans queue up for tickets for the Brazil v Egypt match, about 90 minutes before kick off