Green Bay Packers quarterback Aaron Rodgers left Monday's game in the first quarter with a collarbone injury and did not return.
Following the game, Packers coach Mike McCarthy said the team did not have an exact diagnosis on Rodgers. Earlier, WBBM Newsradio 780 sideline reporter Zach Zaidman said sources told him Rodgers sustained a broken left collarbone.
Rodgers, a right-handed thrower, was hurt when he landed on his left shoulder while getting sacked by Chicago Bears defensive end Shea McClellin on the Packers' first drive.
Backup quarterback Seneca Wallace entered and completed 11 of 19 passes for 114 yards and an interception in Green Bay's 27-20 loss to the Bears.
Before exiting, Rodgers completed one of two passes, hitting wide receiver Jordy Nelson for 27 yards.
Rodgers, 29, took over as Green Bay's starting quarterback in 2008, his third pro season after he was a first-round draft pick out of the University of California. He missed one start in 2010 and one in 2011 but started the team's other 85 games since the beginning of '08, going 57-28 as a starter.