Carter last played for the Patriots in 2011 when he recorded 10 sacks before injuring his quadriceps tendon and being placed on injured reserve.
He wasn't immediately signed to a contract.
The 34-year-old signed a one-year contract this offseason to go back to the Oakland Raiders, but didn't make the final roster cut. He had 2 1/2 sacks last season in a dozen games for the Raiders.
Carter is a former 49ers first-round draft pick from Cal who has 78 1/2 career sacks.
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Aaron Wilson covers the Ravens for The Baltimore Sun.
This story originally appeared on Nationalfootballpost.com
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