Curry will receive a four-year deal worth $32 million to return to Dallas.
Curry averaged 7.9 points per game in 74 contests with Portland. He shot 45-percent from three-point range, which is something the Mavericks hoped to improve on this offseason.
The 28-year-old sat out the entire 2017-18 season with the Mavericks after he suffered a stress reaction in his left tibia in the preseason.
In 2016-17, he started 42 of his 70 games for Dallas and shot 43-percent from distance, while averaging 12.8 points per game.
This is a developing news story.