The document was a letter sent by the chairmen of the NFL's head, neck and spine committee to all team doctors and trainers.
In the letter, Drs. Hunt Batjer and Richard Ellenbogen say one player re-entered a game after suffering a possible concussion and another refused to leave the sideline. Although the letter doesn't identify the players, the AP said they were Green Bay tackle David Bakhtiari and New Orleans cornerback
Bakhtiari went back into the game against San Francisco for an extra-point try, despite not being cleared to re-enter. Lewis remained on the sideline but didn't go back into the game at Philadelphia.
The doctors found "no fault" in how the teams' medical staffs handled the situations.
"If a player refuses to follow your advice and leave the sidelines after being diagnosed with a concussion, we recommend that the head athletic trainer seek assistance from a player's position coach (or another member of the coaching staff) or from another team official to remove the player from the sidelines as soon as possible," the letter said.
No fines will be imposed for the violations, according to the AP.
San Diego center
A jury has been seated for the trial of former
Tampa Bay hired former All-Pro cornerback Gill Byrd, 52, as their cornerbacks coach.
Oakland re-signed offensive line coach