Buffalo Bills running back Fred Jackson will not return to Sunday's game against the New York Jets.
According to Jason LaCanfora of CBSSports.com, he will have an MRI on the knee on Monday, when the team will find out how long he will be out.
The injury is an unfortunate one, as a knee surgery prematurely ended his 2011 season. In the meantime, C.J. Spiller will get the bulk of the carries for the Bills.
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