If it doesn't have one of these, I'll be livid:
In all seriousness, though. It is a slightly odd mix... but it's just going to work. I think a lot of people saying 'I don't see how it can work', doesn't really have the mindset of a storyteller. There's a lot of strands of narrative within the world of football that you can weave into a theme park setting. If anything, this park is completely geared up for that - it's predominantly a show and dark-ride led park.
Football skills, freestyling, individual player narratives, speed, agility, Madrid (as a city), fast cars (synonymous with players) - when you start to break down what you think of football, and footballers and don't just rely on FOOTBALL as a game, it opens itself up to a lot more fun.
A good example of the creative freedom you can have is looking at Ferrari World. At the heart of it, it's fast cars. But, they've managed to create some great storylines by picking individual strands of narrative from the theme and run with it. Look at Mission Ferrari for example.
Another way to do this is by creating a character, or using a mascot character (let's say a bear). They could save the day from 'baddies' utilising football as their defence weapon of choice. It's really easy to create narratives with that mindset.
Not to mention that Real Madrid's sponsors are more than likely going to be inputting into this, of which you have: adidas, BMW and EA Sports to name a few.