FA director of communications Adrian Bevington said: "We are working on that. They will be top level, stellar opponents, quite possibly from South America."

He denied that Germany would provide the opposition, adding: "The Germans are not booked in for us."

The stadium is set to reopen after almost seven years with the first event this weekend's community day for local residents followed by England's Under-21 international against Italy on March 24, for which all 60,000 tickets were quickly snapped up yesterday.

These two 'ramp-up' events will test the facilities at the 90,000-capacity stadium in a bid to obtain a general safety certificate from Brent Council.

Until they are successful, the FA cannot confirm that Wembley will play host to the FA Cup final on May 19.

Bevington added on Sky Sports News: "We are not able to give any confirmation with regards to the FA Cup final.

"Until we have had the two ramp-up events and get the safety certificate it's not really going to be possible to do so.

"But we are increasingly confident. We are all working that we are on track to the FA Cup final.

"You can sense we are very excited about it but it would be foolish for us to confirm something until we are able to do so."

Bevington also insisted the cost of funding Wembley had not affected the FA despite the final cost of £800million being more than twice the original estimate by construction company Multiplex.

"We've had a lot of changes over the last seven or eight years at the FA," Bevington added.

"Now we've got some great planning and financial management in place that will ensure the financial safety of the organisation moving forward.

"We're not a profit making organisation but we do generate a lot of revenue.

"We put around £60million back into the game a year through various routes and plans are in place to ensure we generate enough revenue moving forward through using Wembley properly.

"And we're going to have lots of action at Wembley under a number of different fronts to protect the future of Wembley and football.

"There has been a lot of debate. I've been reading about the £1billion stadium.

"From an FA perspective it cost in the region of £545-550million.

"I think the original set price was £757million and that was with the investment we've seen and other areas of funding we've seen.

"It's not a billion pound stadium from a football perspective - it's just above half that.

"When people see the stadium we can all debate the costs as much as we want but it's such a fantastic stadium it is worth it and it will be worthwhile."

Meanwhile, the FA will make improvements to their computer system after unprecedented numbers of people logged on to buy tickets for the first game at Wembley.

The demand caused the queueing system on the FA's website to fail and a new system will be put in place ahead of ticket sales for future games at Wembley.

England's Under-21 clash with Italy on March 24, will be played in front of a maximum crowd of 60,000 after the tickets sold out in less than six hours.

A total of 154,102 visitors logged onto www.thefa.com yesterday - more than twice the average of 73,900 who accessed the site on the days of England's World Cup games last year - to snap up tickets priced at £10 and £5.