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SANTA CLARA -- The 49ers re-signed cornerback Perrish Cox on Monday, coach Jim Harbaugh said.
The 49ers had an open spot on their roster after placing wide receiver Mario Manningham on injured reserve last week with a knee injury. The 49ers had planned to re-sign Cox after he was released last week by the Seattle Seahawks, Harbaugh said.
Cornerback Carlos Rogers' status is uncertain after he sustained a right hamstring strain in the 49ers' game Sunday against the Arizona Cardinals. Rogers is scheduled for an MRI on Monday.
If Rogers is unavailable for Sunday's NFC playoff game at the Green Bay Packers, Tramaine Brock and Tarell Brown would likely start and veteran Eric Wright would cover the slot receiver in nickel situations. Cox would be back at cornerback and at the nickel position.