Chicago Bears cornerback Bryce Callahan suffered a broken bone in his foot Sunday night against the Los Angeles Rams, according to NFL Network’s Mike Garafolo.

#Bears nickel CB Bryce Callahan suffered a broken bone in his foot in Sunday's win over the #Rams, sources say. Fifth metatarsal. His timeline is TBD but he'll likely be out a while. He was balling, so a tough one for Chicago. — Mike Garafolo (@MikeGarafolo) December 11, 2018

Callahan has been among the Bears’ top all-around defenders and is having one of the best seasons of any nickel cornerback in the NFL. His overall grade of 80.8 from Pro Football Focus ranks in the top 20 of all cornerbacks and is the eighth-best mark on Chicago’s defense.

If Jones fracture, likely surgery and season over. If base of 5th metatarsal fracture, a chance to come back late season/playoffs. https://t.co/5LhKYvaJMY — David J. Chao, MD (@ProFootballDoc) December 11, 2018

Sherrick McManis filled Callahan’s void against the Rams and will continue to be counted on should Callahan miss an extended period of time.

The injury comes at the worst possible time for Callahan, who’s scheduled to hit unrestricted free agency this offseason.

This is the second big injury to hit the Bears this season. Veteran guard Kyle Long was placed on injured reserve early November after suffering a foot injury in the Bears’ win over the Jets.

Chicago can secure an NFC North crown with a win over the Packers in Week 15, but it looks like their effort to slow Aaron Rodgers and Green Bay’s passing game will be down a key starter in the secondary.