ATLANTA — The votes for the NBA’s official postseason awards are due in Thursday and the Knicks will likely have just one honoree — undrafted rookie guard Langston Galloway.

It may be more a testament to the disappointing, injury-wracked rookie class, but Galloway is already receiving placements on the Second Team All-Rookie in published award pieces. The basketball website Sheridan Hoops and The Fort Lauderdale Sun-Sentinel had Galloway on their second team.

Though Galloway seemed to hit a rookie wall in the season’s late stages after playing some nights 40-plus minutes, he is making a case that NBA teams need to look closer at guys who come in mature after playing four years of college basketball.

Galloway played four years at St. Joseph’s and got bypassed in the draft. The Knicks signed him to a 10-day contract off the D-League Westchester squad in January.

“Nowadays it’s off of potential, really,’’ Galloway said before scoring 26 points on 10 of 12 shooting, including 6 of 6 from 3-point land and adding six assists with five rebounds in the Knicks’ upset of the Hawks.

“When you go to school for four years, it’s almost — I don’t want to say it’s bad — but it looks bad because there’s a whole bunch of young guys coming out and they get drafted before all the upperclassmen.’’

Galloway is second in rookie scoring at 11.5 points in 41 games — behind top pick Andrew Wiggins (16.7) — and has played stout defense. Major injuries to Jabari Parker, Joel Embid and Julius Randle devastated the Class of 2014.

Coach Derek Fisher recently cited Galloway as being the leader of the locker room, feeling he helped change the culture of the team after his signing. It came on the heels of the Knicks dumping Samuel Dalembert, J.R. Smith and Iman Shumpert.

“It’s unexpected,’’ Fisher said Monday at the morning shootaround at Atlanta’s Philips Arena. “Not necessarily because of his abilities, but not being on the radar, not being the guy many people even knew about it. Circumstances played out in a way that a great opportunity presented himself and he was ready to take advantage of it.

“A number of guys end up getting opportunities and for whatever reasons and aren’t quite ready to take advantage of it,’’ Fisher added. “Once you kind of know who he is and his makeup, it’s not odd.’’

Galloway hit a series of game-winning or -sealing shots in late January to help the Knicks get on their only roll of the season and has consistently been a two-way force — even if his shot selection has suffered in recent weeks. He’s averaging 32 minutes per game and his shooting percentage dipped to 39.5.

“It means a lot,’’ Galloway said. “If I’m able to make the (rookie) team, that just means something I can build off of. A steppingstone for my career. I got a lot more games to go to prove myself.’’

Gary Neal was the most recent undrafted player to get rookie honors when has named to the first team with the Spurs in 2011, but that came after playing in Europe for three years.

Galloway admits he hit a wall right before the All-Star Break, but feels he came back livelier after the layoff. He said the biggest thing he proved this season is getting to the basket off penetration, but wants to work on finishing stronger and dishing to teammates off his drives.

He’ll be on the Knicks summer-league team in July and expected to be on their roster next season — just in a smaller role that should maximize his assets. He has a $200,000 guarantee if he’s still on the team at the start of camp.

The knee-impaired Carmelo Anthony won’t be feted during the awards. He is expected to miss out on the three All-NBA Teams for the second straight season after having surgery following the All-Star Break on what The Post has reported was a partially torn patellar tendon.