This week, they got confirmation of Schaub's recovery from a Lisfranc injury when he visited Dr. Robert Anderson in North Carolina and got a green light, a team source told ESPN.com.
Schaub suffered the midfoot injury on Nov. 13 on a quarterback sneak coming out of the end zone during Houston's 37-9 win over Tampa Bay. Schaub stayed in the game, but threw only three passes.
Schaub had surgery and missed the rest of the season.
Despite losing him, Houston won the AFC South behind backup T.J. Yates and beat Cincinnati in a home playoff game before losing in Baltimore.
Schaub, who sat out minicamp, is in a contract year and is due a salary of $7.15 million this season.
Schaub's durability was questioned after he missed games in the 2007 and '08 seasons with various injuries. But the quarterback started all 16 games for Houston in 2009 and 2010.
Information from The Associated Press was used in this report.