Looks like they sold the lower areas out first for the Bilbao game, now only tickets in level 4 of the leazes end, imagine they will sell them and move onto Level 7 if there is still demand
Under 1000 seats available currently. Think with 3 weeks to run they may well need to open up L7! I'm also guessing there might be a few away tickets sold up in the level 7 nosebleed seats?