Guard Javonte Green is availabe despite a sore right hip.
Williams logged 17 minutes in the Celtics' 116-106 win over the Dallas Mavericks and wasn't listed on Boston's injury report Tuesday. It will be the second game Williams has missed this season.
Theis also has missed a game due to a sprained ankle early in the season and suffered a sprained finger Monday night against Dallas.
That frontcourt will try to prevent Wizards guard Isaiah Thomas from getting to the rim like he did so effectively during his tenure in Boston.
Don't miss NBC Sports Boston's coverage of Celtics-Wizards, which tips off Wednesday at 7:00 p.m. ET with Celtics Pregame Live, and then Mike & Tommy have the call of the game at 7:30 p.m. You can also stream the game through the MyTeams App.
Celtics injury report: Robert Williams, Daniel Theis out vs. Wizards originally appeared on NBC Sports Boston