Hartenstein (ankle) is listed as out for Sunday's game against the Hawks.
He'll be sidelined for an 11th consecutive game on account of a left ankle sprain. With Hartenstein out, Serge Ibaka will continue to serve as the top backup to starting center Ivica Zubac, who made his return to action in Saturday's 123-108 loss to the Grizzlies after a four-game stint in the NBA's COVID-19 health and safety protocols.