The Patriots signed undrafted rookie OL Zack Roth and cut OL Chris Morris and DL Steve Williams on Saturday.
Roth played right tackle for TCU and was a teammate of Patriots fifth-round OL Marcus Cannon.
Morris signed with the Patriots on Aug. 3. The sixth-year veteran started 10 games for the Raiders in 2009. He did not play in the Patriots' preseason opener.
Williams signed with New England on July 30 and spent the last two seasons in the CFL. He recorded one tackle in Thursday's preseason win.