Barkley completed both of his pass attempts for 19 yards in Sunday's preseason loss to the Vikings.
The 26-year-old played just six fourth-quarter minutes and has been used as the third QB in the 49ers' last two preseason contests. Barkley's lack of playing time and placement at the bottom of the depth chart doesn't bode well for his chances to win the primary backup job over C.J. Beathard, but he could still technically win the position battle if San Francisco elects to place its rookie signal caller on the practice squad to begin the year. Expect an official decision to be made after Thursday's preseason finale against the Chargers.