The injury that forced Detroit Lions quarterback Matthew Stafford to leave Saturday night's game against the Oakland Raiders was a broken blood vessel, according to ESPN's Adam Schefter. Stafford broke a blood vessel in his left hand when it was hit by a Raiders player's helmet.

Stafford said after the game that he would have continued playing if this were the regular season. He also said that X-rays were negative, and Schefter reports that Stafford should be ready for Week 1 of the regular season.

Lions quarterback Matthew Stafford broke a blood vessel in his left hand but still expects to be ready for Detroit's regular-season opener.

— Adam Schefter (@AdamSchefter) August 27, 2012

Typically Stafford and the first-team offense get at least one series in the Lions' final preseason game. It's not clear right now if Stafford will play at all on Thursday against the Buffalo Bills, though.

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