John Gambadoro of Arizona Sports 98.7 Phoenix first reported the hiring. He noted that the press conference to introduce Lovullo be on Monday.
With the move to Arizona, Lovullo will follow ex-Red Sox general manager Mike Hazen out west.
On Oct. 3, the Diamondbacks both fired GM Dave Stewart and manager Phil Nevin at the end of a disappointing season where the team finished fourth in the NL West with a 69-93 record.
Thirteen days later, Arizona brought in Hazen, and ever since, many have hypothesized that he would bring Lovullo with him to fill the manager's role.
The 51 year old Lovullo has been serving as the Boston Red Sox bench coach since 2013. In 2015, he was the Red Sox' interim manager while permanent manager John Farrell missed the end of the season with lymphoma, a type of a cancer. In his absence, Lovullo carried the team to a 28-21 record.
Many around the league thought that Lovullo would be a big league manager at some point during his career, but until now, he has never been given the opportunity for a full-time position despite having interviewed for multiple jobs in the past.
An alumni of UCLA, Lovullo spent parts of eight seasons in the Major Leagues as a player before transitioning into coaching in 2001. Outside of the Red Sox' bench coach job, Lovullo's only other spot in the big leagues was as the Blue Jays' 1st base coach from 2011 to 2012.