Hi dear get an consultation with a knee surgeon in your area and get an mri done..there might be primary ligament injury and secondary meniscus tear...regards dr pankaj agrawal .shoulder knee and joints reconsruction surgeon ahmedabad.

it can be a ligamentous injury or meniscal injury.you should not ignore this problem and dont exert ,dont run or play football.otherwisecondition may worsen.

Avoid exercise tk physiotherapy treatment for 1 week it will completely heal avoid strain

Avoid sitting Cross legged. Avoid Squatting- Quadriceps Exercises- Lie straight, make a towel role and put it under the knee, press the keen against the role, hold it for 20 secs. Repeat 20 times twice a day. This will help relieve some pain. Core Strengthening Exercise- Straight Leg Raised With Toes Turned Outward, repeat 10 times, twice a day.

Twisting injuries of knee sustained while playing are likely to cause injury to collateral ligaments, cruciate ligament, and meniscus of knee. The knock sound you feel is likely to be due to meniscus tear. You need an mri scan and should preferably visit an Orthopedic clinic

There are chances for ligament tear, or a meniscal injury, try to avoid extreme movements and positions, graded exercises will be helpful, make sure that someone do a through evaluation before starting the exercise program, use a knee cap or kinesiology tape for support