Wizards coach Scott Brooks said Mahinmi's strained left calf was re-evaluated and he has "definitely improved, feeling better each day but he definitely won't play the next few games."
The 6-foot-11, 262-pound Mahinmi has missed the start of the postseason after being injured late in the regular season. He averaged 5.6 points and 4.8 rebounds in 31 games this season.
"There's really no timetable, other than whenever he's ready, he's ready," Brooks said before the team traveled to Atlanta for Saturday's Game 3 at Phillips Arena. "There's no pressure from me or our staff."
The Wizards lead the Hawks 2-0 in the best-of-seven series.