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NFL free-agent sleepers

Versatile tailback Roy Helu could stir up an interesting market if he hits free agency. Mitchell Layton/Getty Images

While some NFL executives call free agency "fools' gold" due to the uncertainty that comes with it -- from a player performance and expectation standpoint -- there are certainly values to be had. There are some sleepers who could surprise with new teams in 2015, in the event that their current teams don't re-sign them.

Here's a list of some under-the-radar players who could wind up making an impact, based on conversations I've had with sources from around the league: