Tyson Fury has been seen sporting a black eye just weeks out from his undisputed fight against Oleksandr Usyk.
The pair will finally come to blows in Saudi Arabia on February 17 but Fury's latest video will have some fans concerned.
Fury struggled past Francis Ngannou on points in controversial fashion in his last fight in October.
Many felt his opponent, boxing professionally for the first time, deserved victory after taking the Gypsy King the full 10 rounds.
Tyson Fury sported a black eye on Instagram
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Fury held onto his WBC belt and will put it on the line against Usyk next month.
The Ukrainian holds the WBA, IFB and WBO belts and hopes to become the undisputed champ in Riyadh.
The fighting talk has been going on since the bout was confirmed last November and Fury has continued on social media.
He posted a video on Instagram on Tuesday calling Usyk a "useless piece of s**t".
But it was clear he had taken a blow to the eye during training, as he was sporting a shiner.
Fury was out running with friends as he continues his preparation for the fight.
He said in the video: "Another big day of running in the f*****g mountains, come on.
"Easy work, smashing Usyk's little rabbit face right in for him. The useless piece of s**t."
Fury captioned the post: "Working hard for the undisputed heavyweight championship 2024 #runrabbitrun."
Fury remains unbeaten heading into the encounter, winning 34 of his 35 professional fights.
Usyk is also unbeaten, having won all 21 of his bouts, beating Britain's Daniel Dubois last time out in August.
Former boxer Carl Froch is backing Usyk to come out on top in Saudi Arabia, claiming Fury showed a lack of motivation against Ngannou.
Froch told talkSPORT: "2024 is going to be a fantastic year. Hopefully with a close humdinger with Fury and Usyk.
"I’m picking Usyk for that one, just because of where Tyson Fury is mentally.
"Hopefully Fury can have a good camp and rekindle some of his old greatness in terms of when he fought Deontay Wilder three times.
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Tyson Fury fights Oleksandr Usyk next month
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"He looked good, he looked different every time, he showed us something different. But I don’t know if that’s gone now.
"He struggles to get the weight off him. He seems under-motivated. When he fought Ngannou, he looked confused. Has he got old overnight?
"He carries a lot of weight. I know he doesn’t have to make weight but he does have an optimum fight weight.
"To shift that belly fat and that bread basket that he’s carrying – listen, he’s got weight on him and that weight holds him up. It’s a hindrance, it’s not a help.
"I know you don’t need to be structurally muscular like a weightlifter to be able to perform, but there’s no benefit to having fat round your belly and your love handles.
Tyson Fury beat Francis Ngannou in controversial fashion
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"There’s no benefit to having that, once you get up to 18 or 19 stone, another 2 or 3 stone.
"Hopefully he turns up and gets the job done, because I want those titles to return to Britain, but at the minute I think Usyk wins that fight."