Baltimore Ravens wide receiver Brandon Stokley suffered another concussion on Sunday, Ravens coach John Harbaugh confirmed Monday.
It is believed to be at least the 14th concussion of his football career.
Stokley, 37, will have to go through the league's protocol, which requires that he be cleared by a doctor before he can practice or play in a game.
He played in six games this season and has 13 receptions for 115 yards.
Stokley was signed by the Ravens in August. He was released by the team in early October, but re-signed by the Ravens two days later.