United will warm up for the 2009/10 season with a four-team tournament in Munich on July 29 and 30.
They will square up against hosts Bayern Munich, Argentine champions Boca Juniors and David Beckham's AC Milan in the first ever Audi Cup at the Allianz Arena.
The semi final draw was made in Geneva today. United will play Boca Juniors on July 29. Where the reds win or lose, they will in either the final or the third-place play off the following day.
According to the Bayern Munich website, tickets go on sale tomorrow "exclusively via participating Audi dealers."
They will cost e60, e50, e40, e25 or e12 per day.
More ticket and travel information to follow.