The Texans signed former New York Jets and Kansas City Chiefs outside linebacker Mike Catapano and waived-injured wide receiver Devin Street.
Catapano is a former Chiefs seventh-round draft pick from Princeton.
The 6-4, 270-pounder has recorded 11 career tackles and two sacks since entering the NFL in 2013.
He played in 11 games with four starts last season for the Jets before being placed on injured reserve.
Street got hurt after being claimed off waivers from the Jets. If he clears waivers, he will revert to injured reserve.
A former Dallas Cowboys fifth-round draft pick from Pitt who's also played for the Indianapolis Colts, Street has 10 career catches for 152 yards and one touchdown.