The 49ers are being careful with Foster, who sustained a high-ankle sprain on September 10 against the Carolina Panthers. He returned to practice with his teammates this week.
Also inactive is fullback Kyle Juszczyk, who did not practice at all this week due to a back injury.
Safety Eric Reid (PCL) was not listed among the inactives.
Below is a list of the 49ers' inactive players against Washington:
WR Kerndrick Bourne
CB Leon Hall
DB Dexter McCoil
FB Kyle Juszczyk
LB Reuben Foster
OL Erik Magnuson
LD Dekoda Watson
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