The Chicago Bears already had declared Justin Fields inactive because of a left shoulder injury when more quarterback uncertainty popped up Sunday morning. Trevor Siemian, who prepared all week to start if Fields couldn’t play against the New York Jets, also was injured. During initial warmups on the field at MetLife Stadium about 90 minutes before the game, Siemian could tell “something wasn’t right,” that an oblique injury had “flared up on me.” The Bears announced through their media relations staff about 50 minutes before kickoff that third-stringer Nathan Peterman would start instead. Siemian went back to the locker room, took some medicine and tried to throw again during team warmups.