"The Suns don't necessarily want to make Durant available in trade talks and see him depart the desert, but this situation may be out of their control at this point," Siegel said.

Durant started strong, scoring 16 first-quarter points to help Phoenix stay within four points of Boston. However, in a surprising move, head coach Mike Budenholzer benched Durant to start the second quarter—a decision that backfired as the Celtics extended their lead to 19 by halftime.

The Phoenix Suns proposed trade sees Devin Booker and Kevin Durant leaving the Suns for the San Antonio Spurs and Houston Rockets.