The Patriots waived Montgomery on Friday, Mike Reiss of ESPN.com reports.
Montgomery was on the field for six of a possible 57 snaps on offense in Thursday's 21-18 win over the Steelers, Mike Reiss of ESPN.com reports.
Montgomery played three of the Patriots' 64 snaps on offense and carried once for two yards in Sunday's 6-0 loss to the Chargers.
Montgomery (illness) was a full participant at practice Thursday.
Montgomery (knee) missed Thursday's practice, Mark Daniels of MassLive.com reports.
Montgomery (knee) was a limited participant at practice Wednesday.
New England signed Montgomery to its active roster Saturday, Mike Reiss of ESPN.com reports.
The Patriots have signed Montgomery to their practice squad.
Montgomery (leg) didn't participate in Sunday's practice, Chris Mason of The Springfield Republican reports.
Montgomery (knee/shoulder) reportedly won't return to action this season, Mark Daniels of Masslive.com reports.