Brian Daboll is favorite for Giants coach after hiring Joe Schoen as GM

As new Giants general manager Joe Schoen packs up his office in Buffalo, he might want to find a box big enough to hold Brian Daboll.

Daboll, the Bills’ offensive coordinator, is the early favorite to be the next Giants head coach, sources familiar with Schoen’s short-list told The Post. Schoen, the Bills’ assistant GM from 2017 until joining the Giants on Friday, has worked with Daboll for four seasons and with Buffalo defensive coordinator Leslie Frazier for five.

Schoen immediately started the process, interviewing Daboll Friday night and scheduling Frazier for Saturday (a travel day for the Bills) because it is the final day that first interviews may be conducted with coaches whose teams reach the Super Bowl, according to NFL rules. All three are in Buffalo, and Giants co-owners John Mara and Steve Tisch planned to join by Zoom for introductions.

If the Bills lose Sunday to the Chiefs, then Daboll and Frazier — both of whom spoke to the Bears and Dolphins this week about vacancies — are free to return to the interview circuit. But if the Bills win, further interviews will be prohibited during the week of the AFC Championship, and only second interviews may be done during the first week of Super Bowl preparation. So, this safeguard allows for a second in-person second interview to be arranged the week of Jan. 31 rather than potentially having to wait until Feb. 14.

Former Dolphins head coach Brian Flores — who already has had a conversation with Giants co-owner John Mara in which the parties expressed mutual interest, sources told The Post’s Ian O’Connor — is considered a strong challenger to Daboll. Cowboys defensive coordinator Dan Quinn also is expected to interview.

But Schoen just witnessed a successful in-network partnership when Bills GM Brandon Beane brought head coach Sean McDermott with him from the Panthers, and Mara recently said the Giants GM will drive the head-coach search instead of the way ownership has taken the lead in the past. Both Bills coordinators received votes of confidence Friday from players. The Giants must interview at least two minority candidates for the vacancy to comply with the NFL’s Rooney Rule.

“We haven’t really discussed that at all,” Beane said when asked about Schoen bringing one of the Bills’ coordinators to the Giants. “Just as we’re happy for Joe, we’d be happy for those guys to get that opportunity. … I’d be surprised if they don’t get a lot of looks. I’m hoping both of them get their chance this year.”

Asked why players respond to Daboll, Bills tight end Dawson Knox said: “It’s just the energy he brings. On game day, he’s out there jumping around, getting into the music, hitting every word of a bunch of songs and bopping his head. He is getting everyone fired up. It’s hard not to love a guy like that.”

Daboll just drew up the first “perfect” game — touchdowns on every possession other than kneel-downs — in NFL history to beat the Patriots in an AFC wild-card game.

“Even during the week, he’s bringing the juice on the sidelines, too,” Knox said. “He’s all about giving us confidence, and then when the game starts he is calm, cool and collected. When he comes in at halftime, he’s always got a good adjustment for us. No one expects a roller-coaster with him — you’re not going to get crazy highs and crazy lows.”

Sounds like a future head coach — and maybe the right person to fix the Giants’ NFL-worst scoring offense over the last two years.

“He’s going to work wonders wherever he goes,” Knox said. “Selfishly, we’d love to hold onto him as long as we can, but we also want what’s best for him. Wherever he ends up is going to turn out to be a great franchise.”

The Bills also boast the top-ranked defense in the league, and Frazier’s stock could skyrocket if he befuddles the high-scoring Chiefs. Frazier was 21-32-1 as Vikings head coach from 2010-13.

“He’s the same each and every day,” linebacker Tremaine Edmunds said. “He’s going to be honest with you, and he’s going to put us in position to make plays. I appreciate everything he’s done as far as making me a better player, and I know a lot of guys would say the same. He listens to what the players have to say and he’s educated in what he’s talking about, so that’s where the respect comes from.”