Shooting guard Kevin Huerter also could assume more ball-handling duties.
Backup center Onyeka Oknogwu said Young was “looking good” in the shootaround. While the report was encouraging, the light practice may not have been an adequate test of Young’s ability to push off the ankle.
Williams, the veteran backup, assumes a more prominent role in only his second start with Atlanta this season. He played with Atlanta from 2012-14 before returning to the Hawks this season in a trade-deadline deal that sent Rajon Rondo to the Los Angeles Clippers.
Williams has averaged 6.5 points in the postseason, including only a combined 13 points in the first three games against Milwaukee.
Depth at the position could be a problem. Guard Brandon Goodwin has missed the postseason with a minor respiratory condition. He started five of his 47 games in the regular season.
“Lou has been in this league for a long time,” Okongwu said. “He’s ready for the moment. He knows what he has to do alongside all of us. We know what we have to do tonight.”