Stevenson (concussion) didn't practice Wednesday, Zack Cox of NESN.com reports.
Nor did lead back Damien Harris, with both players still in the NFL's concussion protocol. According to Cox, Stevenson and Harris were spotted taking part in conditioning work on a separate field during Wednesday's session, but until they are cleared to practice, Brandon Bolden and J.J. Taylor are the team's only available options at running back.