It's hard to answer this question.
Your legs could be genetically geared to look a certain way that you're not happy with. If this is the case, you're going to have to learn to manage your expectations.
Or you could be carrying a good big of your
fat on your lower half, in which case you'd have to be in a caloric deficit in order to tap into some of that
fat. The thing is though, you can't preferentially target the
fat on your legs. It's going to leave your
body in a predetermined genetic pattern.
In addition, if the latter is the case,
dieting might not be the best idea if you're interested in performance for football... I'm not sure where you stand in terms of your season.
Do you train your legs with
weights? Also, why do you use machines and not free
weights?