Titans backup RT Dennis Kelly hospitalized; 3rd-stringer Tyler Marz to start vs. Texans

The injury-plagued Tennessee Titans, who already will be without both of their starting offensive tackles Sunday against the Houston Texans, also will be without second-string right tackle Dennis Kelly, who was hospitalized with a virus, a source told ESPN.

Without starter Jack Conklin (knee) and Kelly, the Titans will start undrafted free agent Tyler Marz, whom they signed off their practice squad Saturday.

Marz spent six weeks last season on the Los Angeles Chargers' roster before he was released and signed to Tennessee's practice squad.

Tennessee also will be without left tackle Taylor Lewan (concussion) for Sunday's matchup against the division rival Texans and their vaunted pass rush featuring J.J. Watt.

The Titans also face uncertainty at quarterback, where they remain undecided on whether Marcus Mariota (elbow) or Blaine Gabbert will start, according to a high-ranking team official.

While Mariota is listed as active, another source told ESPN that the quarterback "still isn't able to grip the ball normally."