Cartilage strain in knee?

I strained my left knee cartilage in PE on Thursday but I have a football match on Sunday evening wich is the last game of the season im one of the best goal scorers on my team and we are playing the second team in the league we are 1 point ahead my team mates say I must play for the sake of the team my knee is... show more I strained my left knee cartilage in PE on Thursday but I have a football match on Sunday evening wich is the last game of the season im one of the best goal scorers on my team and we are playing the second team in the league we are 1 point ahead my team mates say I must play for the sake of the team my knee is swollen and stiff what should I do
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