Chicago Bears wide receiver Allen Robinson came out of Monday's game against the Los Angeles Rams after taking a shot to the head and neck area in the fourth quarter.

Robinson has officially entered into concussion protocol, per Bears head coach Matt Nagy.

Robinson stayed down after taking the hit from Curtis Mikell Jr. He stayed on the turf for a few moments and was visibly shaken.

The referees ushered A-Rob to the sideline, though not before he got in a few comments regarding the absence of a penalty flag.

This is tough news for a Bears team already struggling to build momentum on the offensive side of the ball.

Robinson had been the clear No. 1 receiver in Chicago again this year, and he had yet to drop a single pass while leading the NFL in targets prior to Monday's game.

The Bears will be hard-pressed to have sustainable success in the passing game if Robinson has to miss some time.

Los Angeles pummeled Chicago's injury-riddled offensive line up front, repeatedly putting pressure on Bears quarterback Nick Foles and forcing Foles to make difficult throws or simply dump the ball off in the flats.

Foles also had a hard time getting the ball to Robinson, who was frequently shadowed by Rams cornerback Jalen Ramsey. Robinson finished with four catches for 70 yards, but his four targets were by far the fewest this season.

The Bears' offense might have a chance to build a bit of momentum against the New Orleans Saints this weekend. But it could be an uphill climb if Robinson is forced out.