 He made his season debut on November 30, 2016 against the San Antonio Spurs after missing the first 16 games.On February 8, 2018, Harris was acquired by the Denver Nuggets in a three-team trade that also involved the Mavericks and the New York Knicks, in which Doug McDermott was sent to the Mavericks and Emmanuel Mudiay was sent to the Knicks.On March 6, 2018, in a 118–107 loss to the Mavericks, Harris reached 10,000 points for his career.