It's not yet clear how Whitehead will fit into the rotation -- or how much time he'll spend in Detroit. To make room for him on the roster, the Pistons dismissed point guard Keenan Evans from his two-way deal.
At 18-24, the Pistons sit in 10th place in the East, 1.5 games behind the Hornets for the final playoff spot. They've lost 17 of their last 22 games.
As for their interst in Smith Jr., it was reported Monday night that the Pistons have contacted the Mavericks regarding a trade. The Mavs are reportedly actively shopping the No. 9 overall pick in 2017.
In two seasons in Dallas, Smith Jr. has averaged 14.4 points and 4.8 assists per game. He was named to the All-Rookie second team last season.
The trade deadline is Feb. 7.