Matthew Tucker and Kenjon Barner were hurt on back-to-back plays in the second quarter Thursday night against the Jets.
After a four-yard run off the left end, Tucker went to the sidelines and was clearly in discomfort. It was later revealed that he sustained a shoulder injury. Barner replaced Tucker and rushed for five yards on the next play but hurt his ankle on the run and limped off. Tucker returned briefly but was still clearly hampered. Henry Josey and Damaris Johnson carried the load the rest of the way at running back. Josey finished with 121 yards on 22 carries (5.5 average).
Chris Polk practiced this week and was hoping to play even despite not being all the way back from a hamstring injury suffered early in training camp. But he sat out. After the game, he explained that the hamstring just wasn't ready.
Matt Tobin injured his ankle in the first quarter against the Jets. Chip Kelly didn't offer any further update following the game. Tobin is the primary back-up both at guard and tackle.
As for a couple of the starters: Connor Barwin was sidelined at practice this week and has been wearing a sleeve on his right leg. Malcolm Jenkins rested for a couple days but eventually returned to the field.