Organisers are calling on Man Utd fans taking part in the singing section experiment at Old Trafford on Wednesday to get there early.
The Champions League draw takes place on Thursday in Monaco, with Manchester United and City waiting to hear who they'll face this autumn.
Mourinho says Real Madrid versus Manchester United Champions League clash is the 'match the world is waiting for.'
Four key players were missing from Manchester United's training session ahead of Wednesday's Champions League match against Real Sociedad.
Danny Welbeck and Tom Cleverley were absent as well as central defenders Nemanja Vidic and Rio Ferdinand.
Cleverley, Vidic and Ferdinand all missed the weekend's 1-1 draw with Southampton in the Barclays Premier League.
Adnan Januzaj took part in the training session after being added to the Champions League squad as a home-grown player.
After his team Real Madrid recently beat rivals Barcelona twice, Jose Mourinho says he can't wait to kick-off against Manchester United.
The two sides face each other tomorrow evening in the second round of their Champions League Round of 16 tie. The first leg in Madrid ended 1-1.
It's the knockout stages of the Champions League and tonight Manchester United, the three-time winners of the tournament, take on nine-time winners Real Madrid.
Sir Alex Ferguson will meet his old nemesis Jose Mourinho and the Reds come face-to-face with Cristiano Ronaldo.
The last time they met in the quater finals was back in 2002/2003.
The first leg saw Real win 3:1 after two goals from Raul and one from Figo. Ruud van Nistelrooy's efforts in the fifty second minute came too late.
In the second leg Manchester United were triumphant with a 4:3 win at Old Trafford. Beckham scored twice with Nistlerooy and Helguera also finding the back of the net. But Ronaldo's hatrick proved too much for the reds. The win wasn't enough to see them through.