O'Neal, who has played only six games this season because of a
knee injury, hurt his calf in practice Monday and is day-to-day.
The All-Star center returned to the lineup after an extended stay
on the injured list last week.
The Heat have struggled some this season, but they had no problem against the Bucks, winning 110-80.
Also, point guard Jason Williams was inactive against the Bucks
because of a foot injury.