ORCHARD PARK, N.Y. -- Tests revealed that New England Patriots running back Antonio Gibson tore his right ACL, sources told ESPN's Adam Schefter on Monday.

The injury occurred early in the second quarter of the Patriots' 23-20 win over the Buffalo Bills when Gibson took a big hit on a kickoff return and remained down. He immediately clutched his right knee, and when the team quickly ruled him out for the remainder of the game, it foreshadowed the longer-range implications of the injury.

Gibson served as one of the Patriots' top kickoff returners (he had a 90-yard return for a touchdown in Week 2) and the No. 3 option at running back, behind starter Rhamondre Stevenson and rookie TreVeyon Henderson . His role on offense was on the cusp of being increased due to Stevenson's ball-

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