San Francisco 49ers running back Jordan Mason aggravated his shoulder injury during the game against the Cowboys and is currently considered day-to-day. Coach Kyle Shanahan mentioned that Mason could have returned to the game but did not, as Isaac Guerendo took over backfield duties. With Christian McCaffrey expected to return after the Week 9 bye, Mason's role as the lead back may be in jeopardy.

• Jordan Mason is day-to-day with a shoulder injury.
• His role may diminish with the return of Christian McCaffrey.