Fred Jackson MRI inconclusive, 'best case' 4-week return; WR David Nelson tears ACL

Long after the Bills got spanked 48-28 by the Jets on Sunday afternoon the nightmare for Buffalo is continuing, with some big injuries to important players on offense. CBSSports.com's Jason La Canfora reports that Fred Jackson had an MRI on his knee Monday and the results were inconclusive, but that "best case," Jackson returns in four weeks.

Jackson sprained his lateral collateral ligament (LCL) on a nasty-looking tackle (view it above) in the first half and never returned to the game. The Bills were holding out hope that he'd have a positive return on the MRI Monday, but that's not the case, even if the results aren't entirely negative. According to La Canfora, the injury will be monitored over the next 7-10 days.

Much worse news: wideout David Nelson suffered a torn ACL and will miss the remainder of the season, according to the team.

After catching 61 passes for 658 yards in 2011, the 6'5" Nelson looked like a potential breakout candidate for Buffalo. Or, worst case, a really productive slot receiver in Chan Gailey's offense.

C.J. Spiller -- who rushed for 169 (largely worthless) yards on Sunday -- is the obvious replacement at running back. With Nelson out, Donald Jones and rookie speedster T.J. Graham will have to step up and make an impact in the passing game for a Bills team that is suddenly reeling.

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CBS Sports Senior Writer

Will Brinson joined CBS Sports in 2010 and enters his seventh season covering the NFL for CBS. He previously wrote for FanHouse along with myriad other Internet sites. A North Carolina native who lives... Full Bio

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