Barnes (concussion) is doubtful for Sunday's game against the Cowboys, Wes Hodkiewicz of the Packers' official site reports.
Barnes suffered a concussion late in Green Bay's Week 9 loss to Detroit and has been in the league's protocol since. He failed to practice in any capacity, so he is a long shot to suit up against Dallas. Barnes missed seven consecutive games due to an ankle injury earlier in the season.
