Per the Los Angeles Times:
The former USC running back, who has been recovering from a head injury, reportedly was transported to the locker room Monday after dropping to the field during a drill. He was wearing an oxygen mask as he was taken from the field.
Even more strange is why McKnight was even allowed on the field. The running back reportedly had fallen to a knee three times during his walk to the SUNY Cortland soccer field, where the Jets have been holding their practices. A trainer rushed to McKnight’s aid on the third knee, greeting him with water.
McKnight was ‘practicing’ in a non-contract drill and collapsed during a passing play, dropping the ball and falling onto the field – almost as if he completely blacked out.
Trainers were able to assist McKnight off the field to an awaiting medical cart.
The NFL will certainly be involved in why McKnight was even allowed to practice given his odd inability to even walk to the practice field without assistance.