NFC North

Khalil Herbert placed on IR, a move that will test Bears’ top-ranked rushing offense

CHICAGO — The Chicago Bears’ top-ranked rushing offense will be without a primary cog for at least four games after the team placed running back Khalil Herbert on injured reserve Tuesday. Herbert left Sunday’s 31-30 loss to the Detroit Lions at Soldier Field with a hip injury. Coach Matt Eberflus declined to share any injury details Monday, but the move means the team is bracing to be without the second-year running back for a good chunk of the final seven games. Herbert is 11th in the NFL with 643 rushing yards, five spots behind quarterback Justin Fields (749). Herbert ranks second in the le…