O'Brien didn't practice Saturday due to an upper-body injury, Tom Gulitti of NHL.com reports.

EDGE Analysis

O'Brien suffered his injury during a fight with St. Louis' Jordan Nolan in Friday's 4-3 loss to the Blues. The 25-year-old forward is expected to practice Sunday, but won't be in the lineup for the Capitals' preseason finale. He'll be sent to AHL Hershey once he's cleared to play.