The Oklahoma City Thunder have promoted assistant Mark Daigneault to become the franchise’s next head coach, it was announced Wednesday.

Daigneault’s elevation to replace the departed Billy Donovan completes a rapid six-year rise within the franchise, which included a five-year run as the OKC Blue’s G League coach, where Daigneault had a .572 winning percentage and three division titles.

“The opportunity to be the head coach of the Thunder is truly a special honor,” Daigneault said in a statement released by the team. “Over my six years in Oklahoma City I’ve developed a deep commitment to the organization and a care for what is truly a special community that I call home. From my first day here, my values have always been aligned with those of the organization, and I’m looking forward to helping them continue to be lived out on and off the court.”

Daigneault, 35, takes over the Thunder within three weeks of the opening of training camp on Dec. 1 with a roster that could well be in flux between now and opening night on Dec. 22.

Thunder executive vice president and general manager Sam Presti is showing faith in Daigneault’s skill set to transition from what could still be a Western Conference playoff contender in 2020-2021 to something resembling more of a rebuild around key young players such as Shai Gilgeous-AlexanderLu Dort and Darius Bazley. The Thunder are fortified with a possibility of 15 first-round picks and four sets of pick swaps between the 2020 and 2026 NBA drafts.

“We are thrilled to have Mark assume the role of head coach of the Oklahoma City Thunder,” Presti said in a statement. “He has been a selfless and effective leader within our organization since his arrival in 2014. Mark is a values-based leader, continuous learner, and someone that will help us continue the repositioning of our organization on and off the court.”