Team GB face Uruguay in their final group game needing only a point to progress into the knock-out round.
After beating UAE and drawing against Senegal, Stuart Pearce's side only need to avoid defeat against Uruguay to eliminate the South Americans and progress through to Saturday's quarter-finals.
Stuart Pearce has praised the performances of his three over-age players, with Craig Bellamy and Ryan Giggs in particular impressing in the first two group games. And Manchester United striker Wayne Rooney sent a good luck message to his 38-year-old United teammate as he prepares for their crucial match.
On his official Facebook page, Rooney said: "Really enjoying the Olympics. Good luck to my friend Ryan Giggs and the Team GB tonight. Come on lads!"
Team GB have no injuries worries to deal with before the tie, as Giggs - who suffered a tight hamstring against UAE - has been passed fit to lead out the side in the Welsh capital this evening.
Uruguay will be no pushovers though, with Liverpool striker Luis Suarez and Napoli ace Edinson Cavani leading their line. Along with Brazil and Spain, the South Americans were one of the favourites to make the semi-finals, but defeat to Senegal has made tonight a must-win game for Suarez and co.
And Danny Sturridge - who scored a stunning chip against UAE - insists his team won't be playing for a draw against such a dangerous opponent.
"When a draw is good enough to see you through it's always an awkward one because you find yourself playing for a point," said Sturridge. "They get a goal and then you have to open up. You kind of want to score early in the game and then try to see it out if you can do that."
The Chelsea striker pointed to Suarez and Cavani as the danger men for tonight's match. But Gaston Ramirez - a transfer target for Liverpool who plays his club football for Bologna in Serie A - is also one to watch, and scored a cracking free-kick against UAE on Thursday.
Team GB men's team prepares to play for the first time in Cardiff this evening, and it's sure to be a special moment for team captain and former-Wales skipper Ryan Giggs. The match is expected to be a 69,000 capacity sell-out as Olympic fans fill the Welsh capital hoping to see Stuart Pearce's side progress from Group A.