Reimer will start Thursday when the Panthers play the Winnipeg Jets at BB&T Center (7:30 p.m. ET; FS-F, TSN3, NHL.TV).
Luongo had hip labrum surgery in May 2016 and missed the final six weeks of last season with hip problems, but Boughner said this injury is not related to those issues.
"It's not the hip, I can tell you that," he said. "When he went down, everybody was worried about that."
Luongo was out almost eight weeks (24 games) with a groin injury during the 2008-09 season, when he was with the Vancouver Canucks.
Reimer is 4-6-3 this season with a 3.67 goals-against average and .892 save percentage. He started six consecutive games from Oct. 21-Nov. 2 when Luongo was out with a hand injury.
"Last time he had to be in this position, there were some ups and some downs, but for the most part he's a good goalie and we have to support him," Boughner said. "We weren't as good back then as we are now defensively, so we're looking to help him out a little more. We've got to make sure we give him good support and [Reimer] will make the saves. All I ask of him, and he knows this, is to give us a chance to win. And if he gives us a chance to win, we'll be in every game.
"We've had some good talks the last couple of days. I think he's ready to accept the challenge once again. If you watch his practice habits and watch how he hard he works off the ice, he's a pretty dedicated athlete."