Damar Hamlin received CPR after collapsing during Monday Night Football at Paycor Stadium in Ohio.
Hamlin, 24, was in action for the Buffalo Bills as they took on Cincinnati Bengals.
The Bills safety tackled Bengals receiver Tee Higgins, 23, in the first quarter and got up briefly before failing back to the ground after adjusting his headgear.
Hamlin was rushed to Cincinnati hospital by 9.41pm (2.41am GMT) after medical officials administered CPR on the field.
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