10:58 AM PT -- Akim Aliu just spoke further about the racist insults Peters allegedly hurled his way ... and they're disgusting.
"He walked in before a morning pre-game skate and said ‘Hey, Akim, I’m sick of you playing that n***** s**t,'" Aliu told TSN. "He said ‘I’m sick of hearing this n*****s f**king other n*****s in the ass stuff.'"
Aliu added, “He then walked out like nothing ever happened. You could hear a pin drop in the room, everything went dead silent. I just sat down in my stall, didn’t say a word.”
TSN says it spoke with two of Aliu's former teammates who corroborated the story.
Calgary GM Brad Treliving readdressed the media shortly after the report ... and said they have not fired Peters over the allegations yet -- adding the investigation is still ongoing.
The NHL has launched an investigation into claims Calgary Flames head coach Bill Peters called a black player the n-word while he was managing a minor league team 10 years ago.
While the Flames were playing the Penguins on Monday ... ex-NHL player Akim Aliu took to Twitter and accused Calgary's coach of hurling racial slurs at him during their time together in 2009.
30-year-old Aliu played for Peters in the 2009-10 season when the guy was coaching the Rockford Ice Hogs ... and Aliu says on multiple occasions, Peters called him the n-word.
"Dropped the N bomb several times towards me in the dressing room in my rookie year because he didn’t like my choice of music," Aliu said.
Aliu never mentioned Peters by name in the tweets ... but he made it clear he was talking about the 53-year-old coach when he called him Mike Babcock's "protege."
FYI, Babcock -- who was recently fired by the Toronto Maple Leafs -- coached Peters in college and is considered the guy's biggest hockey mentor.
For their part, the Flames immediately announced they were launching a probe into the allegations ... with general manager Brad Treliving telling reporters they take the claims seriously.
The NHL weighed in on the issue Tuesday as well ... saying it's launching a probe too, adding, "The behavior that has been alleged is repugnant and unacceptable."
Peters was not made available to the media after the Flames' game Monday night ... and he's yet to address the allegations himself.