Jennings will open up training camp on the active/non-football injury list, Mike Reiss of ESPN.com reports.
While Jennings isn't ready to practice yet, he can be activated by the Patriots at any time once he is. When he returns to the field, Jennings is in line to compete with Lan Larison, Jam Miller and Myles Montgomery for slotting in New England's backfield behind Rhamondre Stevenson and TreVeyon Henderson.