It could be a lot of things. Most likely is a stress fracture, which is common when you do a lot of walking or running if you haven't built up very carefully. However, if it is painful, it's best to go to a doctor and get it checked out.
A lot of things will naturally heal themselves, but for an athlete, you do not want to take the chance of something healing out of place, or it could completely end your football career. It's very possible that you may need some strapping or bracing material on it.
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