The content creator released a video on social media, saying: “Hey everyone, I’m gonna try make this quick. Me versus Danis is just not going to happen March 29th, man.

“I’ve tried my hardest but my body has legit just given up. I’m currently in bed taking antibiotics just trying to recover.

“But I’m struggling, I’m coughing up greenish, yellow s*** all the time. My sinuses are hurting to the point where I need ibuprofen every day.”

“The tensions headaches right here that I’m getting are more painful than you can imagine. I’m using Sudafed daily,” the YouTuber claimed.

Claiming that he has tried to continue training but simply can’t as his body and stamina has ‘fallen off a clip, KSI said he feels ‘weak’.

“I can’t even taste right now or smell. Basically, I’m f***ed. I’ve been ill for almost three weeks and it’s just not got better.

“I’ve had doctors come around to try and decipher what is going on. Honestly, I’ve never been this ill for this long in my life and I hate it,” he said.

Real name Olajide Olatunji, the British influencer said that ‘it’s depressing’, and then apologised to people he said he’d let down.

“Yeah, I didn’t train this hard for nothing. Either way, I want to say sorry to everyone at Misfits, everyone at DAZN,” the 31-year-old began.

“I wanna say sorry to Sidemen for not being in as many videos as I’d like to be and most importantly I’d like to say sorry to all the fans.”

The YouTuber was set to fight Danis at the AO Arena in Manchester next Saturday (29 March) (Jim Dyson/Redferns/Getty)

While he hasn’t been able to upload videos to help promote the boxing match, he insisted that he wants to set a new date.

“I’m just sick of being sick, man. And yeah, I’m sorry. I wanna move the fight to another day because I still wanna knock out Dillon Danis,” the ‘Holiday’ singer said after coughing.

The pair were set to fight on 29 March as the main card on Misfits 21, titled ‘Unfinished Business’.

Misfits Boxing also took to their accounts to release a statement, reading: “Due to an illness to KSI, Misfits Boxing Unfinished Business, scheduled for March 29th in Manchester, has been postponed.

“A further update will be issued next week, including a new date for the event.”

Their fight has been postponed (DAZN)

KSI hasn’t stepped in the ring since losing out to Tommy Fury in October 2023 at the AO Arena in a controversial majority decision.

It was the influencer’s first loss in the ring.

Since then, he was set to fight both Anthony Taylor and fellow YouTuber Slim Albaher, but pulled out last August with a hand injury.

He announced a fight with Wayne Bridge earlier this year too, though the ex-footballer pulled out after the Sidemen member made comments about his former partner and John Terry.

Danis and KSI were also meant to face off in January 2023, but the former pulled out then, citing personal reasons.

However, the American MMA fighter would go on to make his first appearance in the ring against Logan Paul, on the same night KSI fought Fury, and lost via disqualification.