There aren't any. They've all been taken by the players for the 200 Belgian tourists, the corporates, City in the City, Thomson Travel, viagogo, staff, the OSC and sponsors.
It wasn't worth trying to sell the 5 remaining tickets to the fans. So they're having a competition to give them away to the fans who, when they divide the distance they live from Manchester by the number of years they've been supporting us, come up with the highest number.
Oh and then there's the 100 seats they won't sell so the Sky/BT/BBC commentators can say "I'm amazed they couldn't sell all their tickets for such a crucial game".