Louisiana Tech defensive tackle Vernon Butler worked out for the Texans, according to a source not authorized to speak publicly.
Butler visited the Tennessee Titans, Carolina Panthers, Detroit Lions, Tampa Bay Buccaneers and Buffalo Bills, according to a league source.
Butler worked out for the Oakland Raiders, Carolina Panthers and Tennessee Titans and Houston Texans.
Butler is in Chicago on Thursday for the first round of the NFL draft.
Butler is 6-4, 323 pounds and runs the 40-yard dash in 5.15 seconds, bench pressing 225 pounds 26 times with a 33 1/2 inch vertical leap and a 9-3 broad jump.