As Hook em mentioned here, Big Country had some torn cartiladge in his knee and underwent an arthroscopic surgery procedure this morning. He is only expected to miss 2 weeks. Jim Wyatt says he could be back for the final preseason game, but I expect they will hold him out until the season opener September 7th against the Jaguars. Daniel Loper should get the reps with the first team in Stewart's absence.
If the Titans can escape the preseason with this being the worst injury they will be pretty lucky.