The Dallas Mavericks and Boston Celtics have agreed upon a trade involving Rajon Rondo.

The Mavericks would send Brandan Wright, Jae Crowder, Jameer Nelson, one future first round pick and a future second round pick to the Celtics for Rondo and Dwight Powell.

"The deal is on course to happen tonight," said one source.

Adrian Wojnarowski reports the Houston Rockets have effectively dropped out of talks, with the Celtics focused on wrapping a deal with the Mavericks.