According to ESPN, Houston has named Case Keenum their starting quarterback against the Colts.
Keenum has started one game this season and completed 15/25 passes for 251 yards.
THIS JUST IN: Texans name QB Case Keenum their starter on Sunday vs the Colts.
— NFL on ESPN (@ESPNNFL) October 28, 2013 
Adam Schefter reports that they have named him starter from now on.
Case Keenum To Start Sunday Agaisnt Colts by Sports Talk Florida
Houston moving on: Texans announced Case Keenum as their starting QB moving forward.
— Adam Schefter (@AdamSchefter) October 28, 2013