The Nuggets had upgraded Harris to "questionable" on the team's injury report.
Denver has two games left -- against the Blazers and Minnesota -- and needs at least one victory to clinch a playoff spot.
The Nuggets have won six straight games and eight of 11 in a spirited push for the playoffs.
Harris, 23, has had a breakout season for the Nuggets, averaging 17.7 points, including 48.6 percent from the floor and 40 percent from 3-point range. Harris was injured on March 15.