White, whose 454 yards receiving rank third in the league, was knocked out of Wednesday's practice after hitting his head in a collision with safety Lawyer Milloy. White said, "I'm OK. It's no big deal" after he missed Thursday's practice, but he was held out again Friday.
White leads the Falcons with 26 catches for 454 yards and two touchdowns. He established himself as the team's top receiver in 2007 when he set career highs with 83 receptions for 1,202 yards and six touchdowns.
The Falcons listed another receiver, Laurent Robinson, as doubtful after he was held out with a knee injury. Robinson, still wearing a knee brace, could miss his third straight game.
Atlanta also has injury concerns at defensive tackle, where Jason Jefferson (ankle) is listed as doubtful and did not practice on Friday, and Grady Jackson (knee) had limited participation in practice and is questionable.