Stevenson wasn't spotted at practice Wednesday, Mike Reiss of ESPN.com reports.
Later Wednesday, the Patriots will release their first Week 16 injury report, which should provide an explanation for Stevenson's absence. On the plus side for the New England backfield, Damien Harris (hamstring) and J.J. Taylor -- who had been on the reserve/COVID-19 list -- were on the field during the session, per Evan Lazar of the CLNS Media Network.