Miller has missed the past 14 games with after suffering a second-degree left ankle sprain on March 10. He was able to practice with the Heat on Saturday and is expected to be activated if he has no setbacks.
"Mike's workout was good, it's looking positive," Heat coach Erik Spoelstra said. "Today he was able to do everything, full contact."
Miller is averaging 5.6 points per game but is a valuable role player for the Heat because of his 3-point accuracy and his ability to defend multiple positions.
Miller is shooting 49 percent on 3-pointers this season, which ranks as the best in the NBA, though it doesn't qualify with the leaders because he's only played in 28 games this season, also missing the first month after surgery to repair a sports hernia.
Not having Miller has been a contributing factor to the Heat's offensive struggles over the last several weeks. They were just 8-6 in the games he's missed.