Veteran point guard
Nelson and Vaughn have said Nelson is suffering from a sore left knee.
Nelson last played on March 18, in the opening game of the Magic's recently completed four-game West Coast road trip, and he said his knee was troubling him even before then.
The Magic (19-52) have lost nine consecutive games.
The Trail Blazers (45-26) will be playing on the second night of a back-to-back.