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Polk (knee) rushed four times for six yards Sunday against the Colts.
Polk started last weekend's game against the Patriots, but Alfred Blue took over the backfield Sunday, rushing 20 times for 107 yards. Blue was limited to special teams duty against the Pats but his return to health pushed him back to the top of the depth chart, where he'll likely be in Week 16 against the Titans, which obviously limits Polk's fantasy upside.
