The biomechanics of the body are such that during movement no one part is isolated from another. Different muscles work together around each joint and the movement of one joint has an effect on other joints. Continuing with overhead squat, if during the squat the feet pronate then we may see the knees and hips rotating in. So focusing on the knees dropping in, the hip, feet or knee tissues may be contributing. So what do you do? Check the range of motion of the ankle in dorsiflexion (foot off the gas pedal), hamstrings and adductors. Also check for soft tissue changes in these tissues and the tissues on the side of the hips as well. The muscles on the side of the hips or a small muscle around the knee may be weak. Here's a practical suggestion. Do Peterson Step-ups. Do 2-3 sets x 40-60 seconds/leg. Notice I said time instead of reps. Add resistance as needed.
http://www.jumpusa.com/peterson_step_ups_for_jumpers_knees.html
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