Harris (concussion) didn't practice Wednesday, Zack Cox of NESN.com reports.
Along with Harris, Rhamondre Stevenson was sidelined for the Patriots' first Week 10 practice, as both players remain in the NFL's concussion protocol. According to Cox, the two running backs were spotted taking part in conditioning work on a separate field Wednesday, but until one or both are cleared to practice, Brandon Bolden and J.J. Taylor are the Patriots' only available options at the position.