The Denver Broncos are focusing on improving their offensive line, but that effort suffered a setback when starting left tackle Garett Bolles left Monday's practice after taking a blow to the chin and is being evaluated for a head injury, multiple media outlets reported.
Jared Veldheer, acquired in a trade with the Arizona Cardinals, is expected to anchor the right side of the offensive line.
But there will be questions regarding the left side if Bolles misses time.
Bolles was Denver's first-round pick in the 2017 NFL Draft, and he started all 16 games last season.
Broncos linebacker Brandon Marshall also left practice after suffering a wrist injury, but coach Vance Joseph called Marshall's injury "minor."
Joseph said wide receiver Corey "Philly" Brown is officially in the concussion protocol after taking a shot to the head in a weight room accident.