Hall still is likely to be ready for next summer's training camp, though this second injury and surgery will make it that much more difficult.
Rookie cornerback Bashaud Breeland has replaced Hall in Washington's lineup and has shined, collecting 26 tackles so far this season.
Hall is signed through 2017 and will count $4.8 million against the salary cap next year. The Redskins, however, would save $2.375 million if they don't feel he can return and subsequently release him.
ESPN.com's John Keim contributed to this report.
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