Ellenson has appeared in only 14 games this season for the Pistons, averaging 1.5 points and 0.9 rebounds in 4.0 minutes per game. He's averaged 18.3 points and 8.9 rebounds in 18 games with Grand Rapids.
The Pistons play their next four games on the road and don't have another home game until March 28. The next game for Grand Rapids is Wednesday night.
Detroit took Ellenson with the 18th pick in the 2016 draft.