Nick Foles has a "crack" in his left collarbone, Chip Kelly said Monday, but the injury won't need to be repaired surgically, a source told ESPN NFL Insider Adam Schefter.

Foles is expected to miss a stretch of games, depending on whether the bone was displaced. He is expected to miss six to eight weeks, the source told Schefter.

Mark Sanchez will start at quarterback for the Philadelphia Eagles in Foles' absence.