NFL Players Association executive director DeMaurice Smith told NFL Network’s Ian Rapoport that Pap test report and other papers filed with the league indicate that defensive end Jonathan Casillas’ neck injury in Sunday’s game against the Vikings was the result of “collision of the head with the helmet”.
Smith said Casillas suffered a neck injury during the Vikings’ 31-23 win against the Minnesota Vikings on Sunday night.
The team’s medical staff determined that Casillas fell forward when he hit the helmet with his shoulder while playing through the middle of the field and suffered a mild concussion, according to Smith.
Smith said the club believes that Casills neck injury was a result of collision with the head of the helmet.
Casillas is expected to miss the rest of the season.
The 49ers (3-3) face the Los Angeles Rams (2-3).
Casillas was injured during the first quarter when he was hit in the back by Rams tackle Anthony Davis after he went up for a sack.
He was rushed to the locker room, where he was eventually pulled to the ground.