As Schaub enters a contract year, a debate about whether or not to given him an extension exists.
"They are not going to give him an extension until he proves that he can stay healthy," McClain said.
Schaub has played a full season just twice in five seasons with the Texans. While he's often been hurt, he has been very effective when he is on the field. He has thrown 92 touchdowns compared to 52 interceptions behind center for Houston and led the NFL in completions and passing yards in 2009.
Schaub will enter the 2012 season at 31 years old.
For all the latest off-season news and notes on the Texans, check out Battle Red Blog.