Sanford, 25, appeared in six games as a reserve for the Browns from 2010 through 2012. The Browns dealt him to Seattle in August for guard John Moffitt, but the trade was rescinded after Moffitt failed his physical with Cleveland.
McClain, 23, is a first-year pro from Clemson.
In another Raiders transaction, offensive tackle Willie Smith was placed on injured reserve. He was waived/injured on Saturday and went unclaimed.
All of the Raiders’ moves were disclosed in the NFL’s Sunday transactions.