Harper is currently on a two-way deal with Boston and has appeared in 26 games this season. The 6-foot-5 forward is averaging 3.4 points and 1.6 rebounds in 10.3 minutes per contest, with most of his playing time coming in the second half of the year.
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Prior to joining the Celtics, Harper spent time with the Raptors and Pistons.
According to Spotrac’s Keith Smith, Harper will be signed to a prorated three-year veteran’s minimum contract. The structure of the deal will allow Boston to remain below the luxury tax while filling its 15th roster spot.