Hi, Thank you for providing the brief history of you. A thorough musculoskeletal assessment is advised. As you had a sports injury, the RICE protocol have to be implemented instantly. Now with the mechanism of injury what i understand is that the ball has hit the leg directly and after a few minutes the swelling has started. So there might be a compression injury to the muscles and the vascular system too. Which needs a thorough examination. Using the contrast bath technique will help provide the changes in the vascular mechanism and also the healing process. Also for swollen knee, we need to check for any ligament injury too. For which an MRI might be needed after a sports musculoskeletal assessment. Later stages, with physical therapy you can regain the knee mechanism better under the complete sports rehabilitation of the knee. In my clinical practice, such cases comes with sports injuries and after a thorough assessment and knee rehabilitation the back to sports is achieved.. Regards Jay Indravadan Patel