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The 29-year-old Krishan sustained a cut below his left eye in the clash.
The 26-year-old was to take on Kazakhstan's Amankul Abilkhan in his last-four clash this evening but has been forced out due to the injury.
India have quite a few men capable of occupying the top slot on the podium at the 18th Asian Games.
Krishan fought with a cut sustained just below his left eyebrow before claiming a split decision victory over second seed Ablaikhan Zhussupov of Kazakhstan.
Vikas Krishan (75kg) beat Japanese third seed Sewonrets Okazawa by unanimous decision to qualify for his third Olympics.
Results 1-6
