The Chicago Bears open up their season on Sunday afternoon in Detroit as they'll take on the Lions. 

It's going to be an exciting matchup as the Bears defense is constantly getting hyped up as one of the best in the league heading into the season. 

Unfortunately they'll most likely be without their big offseason acquisition. 

The team has listed Robert Quinn as doubtful for Sunday's game after not practicing all week. 

However there's some good news on the defensive side of the ball as Khalil Mack has only been listed as questionable. 

He was limited at practice all week.