The Buccaneers claimed Williams off waivers Sunday, Tom Pelissero of NFL Network reports.
Williams was waived by the Giants on Saturday, Charlotte Carroll of The Athletic reports.
Williams recorded one solo tackle and two passes defensed -- including an interception -- Thursday in a Week 12 loss to Dallas.
Williams (knee) was not listed on the Giants' injury report Wednesday.
Williams (knee) was activated from injured reserve Monday, Art Stapleton of The Record Sports reports.
Williams (knee) was designated to return from IR on Wednesday, Michael Eisen of the Giants' official site reports.
Williams (knee) was placed on the Giants injured reserve Wednesday, Dan Salomone of the team's official site reports.
Williams (knee) has been ruled out for Sunday's preseason finale against the Jets, Jordan Raanan of ESPN.com reports.
Williams (knee) didn't participate in Thursday's voluntary OTAs, Dan Duggan of The Athletic reports.
Williams (knee) was placed on injured reserve Thursday, Aaron Wilson of Sportstalk 790 Houston reports.