Tim Tebow has not given up hope of making it as an NFL quarterback - the former-New England Patriot has been spotted in training at the University of Southern California baseball diamond.

Tebow was released by the Patriots before the start of the season, with many speculating he could explore a career outside the NFL.

But the former-Heisman winner seems to be set on a comeback. A YouTube video shot by iFolloSports shows Tebow working on his throwing motion with a coach at the California university yesterday.

The ex-Florida Gators superstar's throwing mechanics have been heavily criticised ever since he first rose to national attention in the Sunshine State.

But an impressive one-and-a-half-seasons with the Denver Broncos following a round one draft selection led to a solitary campaign with the New York Jets in 2012.

Rex Ryan then released Tebow, before Belichick signed and cut him in the space of one off-season this year.

But could he be set for a return to the NFL? Check out the video of Tebow working on his mechanics above...

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