The Bucks waived C Jon Horford on Wednesday.
The Bucks have requested waivers on Charlie Westrbook.
Michael Carter-Williams started in Tuesday's preseason loss, but played just 15 minutes and finished with six points, two rebounds, two assists and a steal on 2-of-4 shooting.
Greg Monroe started at center and hit 3-of-7 shots for six points, four rebounds, one steal and zero blocks in just 17 minutes of Tuesday's preseason loss to the Bulls.
Giannis Antetokounmpo started at forward for the Bucks on Tuesday's preseason game and had six points, seven rebounds, two steals and a great dunk in just 17 minutes.
Rookie Rashad Vaughn started at shooting guard for the Bucks in Tuesday's preseason loss to the Bulls and hit 8-of-14 shots and three 3-pointers for 20 points, three rebounds and two assists in 35 minutes.
Jerryd Bayless (no injury) and Chris Copeland (personal) will not play for the Bucks on Tuesday.
Jabari Parker, who is recovering from knee surgery, may still be a couple weeks away from playing for the Bucks.
Michael Carter-Williams (leg) will start Tuesday's preseason game vs. the Bulls.
Jabari Parker (knee) will not play vs. the Bulls on Tuesday.
Coach Jason Kidd said Jabari Parker (knee) "is getting better each time he takes the floor."
Jason Kidd said Greivis Vasquez will spend time at both point guard and shooting guard this season.
Michael Carter-Williams credited teammate Greivis Vasquez for helping him on the court.
Michael Carter-Williams limped off the court during Saturday's scrimmage.
Jabari Parker (knee) will scrimmage on Saturday.