Peyton Hillis has been one of the major surprises for the Cleveland Browns since they acquired him in a trade with the Denver Broncos.

The unheralded running back, who labored in the shadows of Darren McFadden and Felix Jones at Arkansas, has become quite the hit as a blue collar back for the Browns.

But the color that is missing from the equation for Hillis green, as the Browns have yet to extend Hillis' rookie contract, which expires this year. Hillis is making $555,000, and according to the Cleveland Plain Dealer, Browns GM Tom Heckert had no comment regarding any contract talks with Hillis or his agent. The Browns have in recent weeks extended the contracts of left tackle Joe Thomas, tight end Evan Moore and defensive tackle Ahtyba Rubin.

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Terry McCormick covers the Titans for TitanInsider.com