Our expert says:
Stressing the knee by running, jumpiing, squats and other exercises causes the pain to appear. Whenever there is pain, then a person does not work to their full potential.
Damage can be to the patella region of the knee ( the knee cap).
One can play but the pain will limit performance and is not really a good idea.
At the very least, give him 3 months off and he should be stretching his hamstrings and Quadriceps as these are often too tight, then retry playing, if he must..
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