The Magic say an MRI on Carter's left knee was negative and he was diagnosed with a sprain. Orlando did not practice Tuesday.
Carter was injured in the Magic's 106-97 loss at San Antonio on Monday night. In the fourth quarter, Carter made a spin move and layup but his left leg landed awkwardly. He limped off the floor and did not return.
If Carter can't play, J.J. Redick will likely start in his place and be charged with guarding Dwyane Wade. The Heat routed the Magic 96-70 behind Wade's 26 points in the first meeting in Miami this season.