Cutler, who was not playing well prior to suffering the concussion, took a hard hit to the head late in the second quarter but remained in the game until the intermission. He did not return in the second half as Jason Campbell took over.
Coach Lovie Smith said he didn't know what Cutler's status would be for next Monday night's game at San Francisco.
Smith did say that Cutler's concussion symptoms started to clear up during the second half and that the quarterback wanted to go back in, but "that decision was made for him" by the team doctors.
Smith said he didn't know which hit that Cutler took might have caused the concussion, and said he didn't know what concussion symptoms were present.
"I try not to be Dr. Smith too often," said Smith, adding that he accepted what he was told by the doctors.