I Got Accidentally Kicked In The Space Below The Knee.

I got accidentally kicked in the space below the knee. As I train football players and was running as the defender on a receiver I train. It hurt a lot when it happened for about 5 minutes or so. Then about 30 minutes later it only hurt when I jogged. But, a few hours later and now it hurts a lot more even when walking. What do you think I have?