LAS VEGAS — Brock Lesnar threw some shade the way of Jon Jones at UFC 200 open workouts Thursday.

The former UFC heavyweight champion said Jones was "unprofessional" for failing a drug test ahead of his big main event fight with Daniel Cormier on Saturday here at T-Mobile Arena. USADA notified Jones of a potential anti-doping violation Wednesday and Jones was pulled by the UFC from the light heavyweight title fight.

"It's unfortunate for DC, I guess," Lesnar said. "I feel a little bad for DC. Guys go hard, they go through training camps and put lots of time in and that's where DC really gets the short end of the stick. It's really unprofessional of anybody of this caliber when something like that happens."

Lesnar's bout with Mark Hunt will now be the main event of UFC 200. The women's bantamweight title fight between champion Miesha Tate and challenger Amanda Nunes is the new co-main event. Cormier is currently in limbo. He stands to lose millions of dollars if he doesn't fight and the UFC is still looking for a very short-notice opponent for him. UFC president Dana White told Colin Cowherd on Thursday that he would still fight.

Lesnar, 38, goes back a long time with Cormier. Both are former standout NCAA wrestlers. The WWE star was definitely bummed for his friend Thursday. But, like he was for UFC 100, Lesnar is now the main event for UFC 200.

"It's unfortunate," Lesnar said of Jones. "It's unprofessional. That's just what it is. What else can I say? Merry Christmas to Brock Lesnar."

Jones will go through a proper results management process by USADA. The former longtime UFC light heavyweight champion spoke to reporters Thursday morning and denied knowingly taking any kind of performance-enhancing drug. Jones said he wasn't sure why he tested positive in the drug test for a substance he said he couldn't even pronounce. Jones' manager Malki Kawa implied Thursday that Jones might have taken a tainted supplement.

Workers were removing the faces of Jones and Cormier from the T-Mobile Arena façade Thursday afternoon. Lesnar and Hunt are oddly the new UFC 200 main event despite having their fight book just about four weeks ago.

"I've been in the business long enough — the entertainment industry, the fight game — the show still goes on," Lesnar said. "Regardless of where I'm at on the card, the show is gonna happen. I'm just thankful that I got through training camp healthy and I'm here. Merry Christmas to Brock Lesnar."