Williams will play for the Kings' summer league team, Emiliano Carchia of Sportando.com reports.
Williams signed a contract with Turkish club Galatasaray in September, Eurohoops.net reports.
Williams had five points (2-7 FG, 1-2 FT) and 16 rebounds in Thursday's win over Boston.
Williams will start Thursday's game against the Celtics.
Williams scored 18 points (9-11 FG, 0-1 3Pt, 0-0 FT), 13 rebounds, two assists, one steal and one block in Saturday's G League loss to Canton.
Williams agreed Sunday to re-sign with the Wizards on a two-way contract, Candace Buckner of The Washington Post reports.
Williams was waived by the Wizards after Saturday's win over the Nuggets, Candace Buckner of The Washington Post reports.
Williams will start Saturday's game against the Knicks.
Williams terminated his contract with Israeli club Maccabi Rishon LeZion on Monday and is expected to sign with an NBA team this week.
Williams delivered 13 points (6-10 FG, 0-1 3Pt, 1-1 FT) and six rebounds across 26 minutes during the Rockets' 87-78 win over the Jazz in a Las Vegas Summer League game Thursday.