The Houston Texans could soon be adding a new quarterback to a depth chart that became considerably weaker once Sage Rosenfels was traded to the Vikings. Agent Drew Rosenhaus has announced that Rex Grossman, a first-round pick six years ago who has become largely forgotten during his stint on the free-agent shelf, will visit the Texans on Thursday night. Rosenhaus said he anticipates that Grossman will sign a one-year deal. If Rosenhaus is right, the former Bears starter will join Matt Schaub, Dan Orlovsky, and Alex Brink as the four quarterbacks heading into training camp. The real question is whether Grossman is merely a camp arm -- or whether he has a legitimate shot at making the 53-man roster. His chief competition likely will be Orlovsky, who signed as a free agent. So the options to serve as the backup to Matt Schaub (who missed five games in each of his two years as a starter) will be a guy who runs out of his own end zone, or a guy who stays in bounds and fires a deep ball that is caught by the other team.