No you are not doing too much.
If you can get one of your runs up to and beyond 10k then that is good, it will help with the endurance aspect.
If you keep your other 2 runs slow as well this will help, guessing that your football is all short sprint work, therefore if you keep your running slow you will give yourself the best chance of recovery. Steady slow running at this time is what I'd recommend.
Don't try to do too much, this is what will lead to injury. Because you are fit you can already run a reasonable distance. However your legs aren't used to it so build up the distance slowly. There's a rule of thumb that says 10% aincrease a week which is good to stick by.