Drew, who was facing the Hawks for the first time since being sacked by the franchise last season, claims that some of his players are at threat of missing out on court time.
"This was a totally, totally unacceptable performance," Drew told reporters. "Do we have anything inside that will allow us to go out and compete at a high level?
"I'm going to have to go with the guys that play hard. You're not going to play hard? You're not going to play."
The Bucks have lost 35 of their 43 games this season.