The Facts: According to FOXSports.com's Alex Marvez, tests have confirmed that Keller (knee) out for season.

Diehards Line: Keller was carted off the field during Saturday's preseason game against the Texans after Houston safety D.J. Swearinger broke up a pass intended for Keller, going low while making direct contact with his helmet against the tight end's knee. Keller's leg bent backwards. With Keller's season over, the Dolphins will ask Charles Clay, Michael Egnew and rookie Dion Sims to step up. It's a big loss for a Dolphins offense that is searching for an identity (subscribers can hit our AugustUpdate Dolphins page for more on this story).