Sources: Sacramento Kings acquire Tristan Thompson in three-team deal with Boston Celtics, Atlanta Hawks

The Celtics, Hawks and Kings agreed to a three-team trade Friday that allowed Sacramento to acquire  Tristan Thompson, Atlanta to obtain  Delon Wright and Boston to receive  Kris Dunn, Bruno Fernando and a 2023 second-round pick, sources told ESPN's Adrian Wojnarowski.

Thompson, 30, averaged 7.6 points and 8.1 rebounds in 54 games for the Celtics last season, his first playing anywhere outside of Cleveland, where he spent the first nine years of his NBA career. But with the emergence of third-year center Robert Williams III, plus the return of center Al Horford as part of the Kemba Walker trade last month, there wasn't a need for Thompson any longer in Boston.

Now, though, he's headed to Sacramento, where he will give the Kings insurance at the center spot with starter Richaun Holmes set to be an unrestricted free agent Monday.

Dunn, 27, played just four games during the regular season as he dealt with multiple injury issues and then saw a total of 33 minutes of action across five playoff games during Atlanta's run to the Eastern Conference finals.

If healthy, the former  Providence College star could provide the Celtics some defense on the wing. Fernando, meanwhile, who will turn 23 in August, averaged 1.5 points across 33 games last year for Atlanta. He was the 34th pick in the 2019 NBA draft.

All four players in the deal are on expiring contracts. Thompson is set to make $9.7 million; Wright will make $8.5 million; Dunn will receive just over $5 million; and Fernando is set to get  $1.7 million.

The Celtics will shave about $3 million off their books heading into free agency thanks to the deal, giving them further flexibility below the luxury tax line as they explore the possibility of re-signing guard Evan Fournier, among other potential moves.

Wright, meanwhile, averaged 10.2 points, 4.3 rebounds and 4.4 assists in 63 games split between the Detroit Pistons and the Kings last season. The 29-year-old, now playing for his sixth team, gives Atlanta some depth in the backcourt behind Trae Young, who he can either serve as a backup to or play alongside impending free agent Lou Williams if the Hawks re-sign him.