Chris Mullin’s coaching staff at St. John’s appears close to completion.

Sources told The Post former South Alabama assistant coach Dejan Matic, a Brooklyn native like Mullin, has been hired as the director of basketball operations. NBA Hall of Famer Mitch Richmond is expected to be on the staff as well, along with Greg St. Jean, the son of former Kings coach Garry St. Jean.

St. Jean is expected to be the third assistant coach, joining Matt Abdellmasih and Barry “Slice” Rohrssen, though the 50-year-old Richmond — Mullin’s teammate with the Warriors who has spent time as a scout with the NBA organization — remains an option for the spot as well. St. Jean was on the road during the live recruiting period with St. John’s, but hasn’t been officially hired.

The 31-year-old Matic attended the Dwight School in Manhattan and played college basketball at Trinity Christian College in Chicago. He is close to Abdelmassih, and said in a phone interview he began hearing from St. John’s a few weeks ago. Though it is technically a step down, going from an assistant coach to director of basketball operations, he couldn’t pass up coming back to New York City.

“Getting a chance to come home and obviously work with Chris, that’s a big thing,” said Matic, a quality recruiter who spent two years as an assistant at South Alabama and one at Southern Illinois following a junior college stint at Olney Central College in Illinois. “I grew up five minutes from campus. Getting a chance to be in the Big East and whatever my title is, we’re all going to be working to get this program in the right direction.

“Everyone is really excited about Chris getting the job. I just want to be a part of it.”