Patrick Graham is returning to the Giants after two seasons away.

He won’t find many familiar faces.

The Giants hired Graham as defensive coordinator on Sunday, and he will call the defensive plays for new head coach Joe Judge, The Post confirmed. Graham, 40, was under contract as the Dolphins’ defensive coordinator but given permission to interview for the lateral move.

Both Graham (2009-15) and Judge (2012-19) are former Bill Belichick assistants, and their tenures with the Patriots overlapped for three seasons. Graham left to be the Giants’ defensive line coach on Ben McAdoo’s staff in 2016-17 but was not retained by Pat Shurmur, moving on to the Packers for one season.

If, as expected, Eli Manning and Zak DeOssie do not return to the Giants, there will not be any players on the roster who predate the 2016 season. In fact — in a sign of the extreme roster overhaul orchestrated by general manager Dave Gettleman — only one remaining defensive player (Dalvin Tomlinson) played for Graham during his first stint.

Two years ago, the Giants were ecstatic to land James Bettcher as defensive coordinator, after he led the Cardinals defense to three straight top-10 rankings. Bettcher’s success didn’t carry over with the Giants, whose veteran-laden group ranked No. 24 in total defense in 2018 and slipped to No. 25 in 2019 with a younger cast.

Graham will need to get much more production out of second- and third-year players such as Lorenzo Carter, B.J. Hill, Oshane Ximines, Dexter Lawrence, and DeAndre Baker if the Giants are going to take a step forward.

The Giants will be a multiple-front defense, according to Judge. He wants “teachers” in his assistants.

“I think presenters can be passed off as salesmen,” Judge said this past week. “They can stand in front of a crowd, stand in front of a position group and talk fancy and make it look good, but at the same time, they can create a cloud of information. I think teachers paint a clear picture that you can mentally see what it is, what it should look like, how you have to get there and why it’s important.”

By hiring Graham, Judge, 38, bucked (for now) the theory that he needs to surround himself with experienced top-level assistants. Giants co-owner John Mara would like to see a former head coach on staff as a reliable resource, but he and general manager Dave Gettleman empowered Judge with final say on his staff.

It is possible Judge will check two boxes with one hire for offensive coordinator, bringing in a quarterback-savvy former head coach like Jim Caldwell or Jason Garrett. Actually, it seems important that he does.

Graham is the third member of Judge’s staff, joining Shurmur era holdovers Thomas McGaughey (special teams coordinator) and Tyke Tolbert (wide receivers).

NFL Network first reported Graham’s hire as well as the promotion of Josh Boyer as his replacement in Miami. Dolphins coach Brian Flores coached with Graham and Judge in New England.

The Dolphins ranked No. 30 in total defense, No. 26 in passing defense and No. 27 in rushing defense last season. Graham worked with a similarly young roster, as the Dolphins and Giants ranked first and second, respectively, in snaps played by rookies in 2019.

The Giants also had interest in Saints defensive backs coach Aaron Glenn — a former Jets cornerback — as defensive coordinator, a source told The Post. It is possible he winds up in another position on the staff.