Schaub says his surgically repaired right foot is fully healed. After starting all 16 games in 2009 and '10, Schaub missed the final six games and the playoffs last season with a fractured Lisfranc joint.
Johnson, meanwhile, says he's been running routes for Schaub for "the past few weeks." He says he'll be "full-go" when practices begin following arthroscopic surgery on his right knee in May.
Johnson sat out nine regular-season games last season with hamstring injuries.
Johnson turned 31 on July 11, and he's heard from outsiders that he's getting old and his best years are behind him -- some added incentive for this season.
"I know I can still play at a high level, I know I can still put up big numbers," he said. "It's definitely motivation. It's fun, I laugh at it."
Houston went 10-6 last season, won its division and the franchise's first playoff game before losing to Baltimore in the divisional round. Now, the Texans say they're ready to embrace the pressure of being a marked team.
"We have the right frame of mind and the right leadership on this team to attack those type of environments," Schaub said. "To get to where we want to go, you have to go through those things. You have to go on the road in tough environments, and win those types of games."
Information from The Associated Press was used in this report.