Detroit signed the running back to a two-year, $7 million contract extension with $4.3 million in guaranteed money, NFL Media Insider Ian Rapoport reported, according to a person involved with the contract.
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Coupling the extension with the second-round restricted free-agent tender the Lions placed on Bell, the runner is signed in Detroit for three seasons at $9.3 million.
The signing is a big one for the Lions, who lock up the one-two, Bush-Bell punch in Detroit's backfield.
The Wayne State University product earned 650 yards on 166 totes in 2013 while splitting carries with Bush.