"I haven't gotten any indication of when to expect him back," Drew said.
Williams missed the Hawks Western road trip after suffering a lower back injury in a fall against Golden State. The Hawks have gone 5-1 in the six games that Marvin has been out.
On the season, Marvin has missed ten games with a knee injury and his current back injury. Williams is averaging 11 ppg and 4.8 rpg on the season.