Darius Fleming tears ACL
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SANTA CLARA -- Linebacker Darius Fleming will miss the second straight season of his NFL career with a torn left ACL, according to a source.

The 49ers waived/injured Fleming and signed former San Jose State linebacker Travis Johnson to the 90-man roster. If Fleming clears waivers, he will revert back to the 49ers and spend the season on injured reserve.

Fleming sustained his latest injury on Sunday in a non-contract kickoff cover drill. He was wearing a brace on his left knee after re-injuring the knee in early June.

The 49ers invested a fifth-round draft pick in the Notre Dame product in 2012. But in Fleming's first appearance on the 49ers' practice field he sustained a torn ACL during the rookie minicamp.

Fleming spent the entire 2012 season on injured reserve. After being cleared to return to practice, Fleming was moved from outside linebacker to inside linebacker.

Fleming becomes the fourth long-term injury to a 49ers player this offseason. In May, wide receiver Michael Crabtree sustained a torn Achilles tendon. The 49ers expect him to be ready to return to action late in the regular season.

Fullback Alex Debniak (Achilles) and wide receiver Brandon Carswell (ACL) have been placed on injured reserve with their injuries.