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The Marcus Lattimore rumor mill heightened Monday morning as speculation about his NFL future picked up across the Internet. 

The Lattimore rumors first started Sunday evening when a report from CSNBayArea.com surfaced about the 49ers running back contemplating retirement as he experienced soreness in his surgically-repaired knee in two practices last week. Lattimore is attempting to return from a major knee injury he suffered in college in 2012.

The retirement speculation took off Monday morning when ESPN reported a league source said Lattimore is expected to retire. Lattimore's agent, Michael Perrett, was quick to squash that rumor, as he posted on Twitter that no decision has been made about his client's NFL future.

NFL.com joined the fray as well by reporting Lattimore will meet with trainers and doctors Monday to figure out the reason for Lattimore's knee soreness. Lattimore is not believed to have suffered any structural damage in his knee since returning to practice last week, according to The Sacramento Bee.

Lattimore has suffered major injuries to both knees. In 2011, he tore the ACL and MCL in his left knee. In 2012, he suffered three torn knee ligaments and a dislocated kneecap in his right knee, which required reconstructive surgery. Lattimore has yet to take a snap in the NFL since being a fourth-round pick in 2013.