Dion Lewis will undergo surgery to repair a broken leg. (Diamond Images/Getty Images)
Browns backup running back Dion Lewis, who was carted off the field Thursday night during a preseason game against Detroit, will need surgery to repair his fractured fibula.
In Thursday's game, Lewis had 33 yards on five carries, with his average being padded by a 31-yard run. The Browns are unsure if Lewis will go on injured reserve, reports Mary Kay Cabot of the Cleveland Plain Dealer.
With running back Montario Hardesty already projected to miss the first few weeks of the season, backfield depth has become a concern for the Browns. Trent Richardson, the starter, missed the first preseason game with a shin injury. Cleveland has been giving Chris Ogbonnaya a look at fullback.
Lewis, a fifth-round pick of the Eagles in 2011, played in nine games for Philadelphia last season. Cleveland acquired him via a trade for linebacker Emmanuel Acho.