"Dallas Clark's preseason has been reduced to "mental repetitions" and rehabilitation after he suffered an injury to his left leg in training camp.

Although the injury might result in Clark missing all four preseason games, the Indianapolis Colts' Pro Bowl tight end vowed to be ready for the Sept. 12 regular-season opener at Houston.

"The good thing is it's making improvement and, worst-case scenario, I'll definitely be there for Week 1," Clark said Monday. "That's a reassuring thing."

Neither the team nor Clark would address the nature of the injury.

"I don't think it's been mentioned," Clark said, "so I don't want to be the guy to let the cat out of the bag."

Clark hasn't returned to practice since coming up lame during a passing drill in training camp Aug. 13 at Anderson University."