According to Wojnarowski, Mack, the former Butler Bulldogs star point guard and the Wizards' 2011 NBA Draft pick, is expected to join Washington on Monday. The 22-year-old Mack is replacing guard Shaun Livingston, who was cut Saturday night by the Wizards.
Livingston started Saturday, however, played only 12 minutes and collected two points.
Last season, Mack played in 64 games for Washington, however, he did not produce much and was waived in October.
Mack was then drafted by the NBA D-League's Maine Red Claws where he was averaging 20 points per game.
Currently, Washington (3-22) has the worst record in the league and is in the middle of a seven-game losing streak. On Saturday, the Wizards lost to the Detroit Pistons, 96-87, and will take on the Cleveland Cavaliers on Wednesday (7 p.m. ET).