NASHVILLE, Tenn. -The Tennessee Titans' defensive line depth could be an issue when the team faces the Houston Texans on Sunday.
Defensive end Dave Ball (concussion) and tackles Tony Brown (knee) and Jason Jones (knee) all missed practice for a third straight day Friday. Ball is listed as doubtful, while Jones and Brown are both questionable.
Also, kicker Rob Bironas (groin) did not practice Friday, but is probable. Tight end Craig Stevens (knee) was limited for a second straight day and is questionable.
Quarterback Kerry Collins was out of practice, but did work on some dropbacks and throws on the side. He is questionable and will be the third quarterback behind Rusty Smith and Chris Simms.
Receiver Kenny Britt (hamstring) is out, while receiver Lavelle Hawkins was excused from practice Friday but is expected to play.