Niang's more than $8 million salary will go into Utah's trade exception from the John Collins deal. In a related move, the Celtics have agreed to a one-year, $3.3 million deal with free agent forward Chris Boucher, agent Sam Permut of Roc Nation told Charania. The Niang trade allowed Boston the flexibility to remain below the second apron after adding Boucher. Boucher, whose deal with Boston is guaranteed, will have a significant role in the Celtics' frontcourt. Niang, 32, was acquired by the Celtics in the Kristaps Porzingis trade with the Atlanta Hawks.