Alexander had to have the surgery in January following a reconstruction procedure in August when he first was injured.
Alexander has a lengthy history of problems with his knee.
He's a pending unrestricted free agent who caught 37 passes for 658 yards and seven touchdowns in 2012.
For his career, Alexander has 83 catches for 1,395 yards and 10 touchdowns.
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Aaron Wilson covers the Ravens for The Baltimore Sun.Follow @footballpost on Twitter for the latest news
This story originally appeared on Nationalfootballpost.com
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