The person spoke to the Associated Press Sunday on condition of anonymity because the deal cannot be finalized until the NBA's moratorium ends Thursday.
Gibson has spent the bulk of his career in Chicago, including five seasons under Thibodeau. The Bulls traded him to Oklahoma City late last season.
For his career, Gibson has averaged 9.4 points and 6.3 rebounds. In Minnesota, he'll be a new addition along with another former Bulls teammate — Jimmy Butler, who was traded to the Timberwolves last month.
And now that's been proven as Ibaka agreed to terms with the Raptors on a three-year contract with $65 million, a person with knowledge of the negotiations told the Associated Press.
The 27-year-old Ibaka was traded to Toronto from Orlando late last season. He averaged 14.2 points and 6.8 rebounds in 23 games with the Raptors.
“His style of play fits our style of play,” Raptors coach Dwane Casey said when the trade was made.
Ibaka is one of only 13 players in NBA history to make 100 tehre-pointers and record 100 blocked shots in the same season; he did it last season, along with Karl-Anthony Towns, Kristaps Porzingis and Brook Lopez.
He was sent to Toronto by Orlando, in exchange for Terrence Ross and a first-round draft pick — a big price that would have looked even bigger if the Raptors had lost Ibaka for nothing this summer.
Entering his ninth NBA season, Ibaka has career averages of 12 points and 7.3 rebounds. Ibaka spent his first seven NBA seasons in Oklahoma City, helping the Thunder reach the 2012 NBA Finals against Miami.
In other free-agent news:
-- Kyle Korver reached agreement with the Cleveland Cavaliers on a three-year deal worth $22 million, a person with knowledge of the agreement told the Associated Press. The person spoke on condition of anonymity because a contract cannot be signed until the moratorium ends on Thursday. Korver joined the Cavs midway through last season in a trade from Atlanta. The 36-year-old mad his first trip to the NBA Finals in his 14th season in the league. He led the league in three-point shooting last season, making 45.1% of his shots. Korver knocked down 48.5% of his three-pointers on 5.7 attempts a game for the Cavaliers.
-- The agency that represents Jodie Meeks, ASM Sports, sent out a tweet saying the free-agent shooting guard has agreed to join the Washington Wizards. That post did not mention any terms, but a person familiar with the agreement tells the Associated Press that Meeks will get a $7-million, two-year deal.
-- Forward P.J. Tucker has reportedly agreed to a four-year, $32-million deal with the Houston Rockets, who also re-signed Brazilian big man Nene to a three-year deal worth $11 million. Tucker finished last season with the Raptors. The 6-foot-6 Tucker has averaged 7.7 points for his career and shot 40% from three-point range after joining the Raptors. Tucker and Nene, along with fellow newcomer Chris Paul, join forward Trevor Ariza in giving Mike D'Antoni some strong individual defenders.