CNN —The NFL and the NFL Players Association are looking into an incident in which an apparent head injury to New England Patriots wide receiver DeVante Parker seemingly went unnoticed by medical staff and spotters, league spokesman Brian McCarthy tells CNN.
Jeff Dean/AP Los Angeles Chargers wide receiver Mike Williams catches a pass against Miami Dolphins cornerback Xavien Howard on December 11.
Marcio Jose Sanchez/AP Minnesota wide receiver Justin Jefferson dives for a two-point conversion during the Vikings' 29-22 victory over the Chicago Bears.
Gerald Herbert/AP Indianapolis Colts wide receiver Michael Pittman Jr. is tripped up by Denver Broncos cornerback K'Waun Williams.
Gary A. Vasquez/USA Today Sports/Reuters New Orleans Saints wide receiver Michael Thomas makes a reception against Atlanta Falcons cornerback A.J.