Tyson Fury witnessed Anthony Joshua and Francis Ngannou square off at the ring.

After the fight, The Gypsy King went on an X-rated tirade backstage.

It’s unclear who the WBC heavyweight king was shouting at.

In the second round of their fight in Saudi Arabia, AJ dropped the former UFC heavyweight champion with a vicious overhand right as Fury, 35, was seated next to his wife, Paris.

And when he walked out of the Kingdom Arena, he seemed pumped up.

Backstage, the WBC heavyweight champion was seen on camera lamenting the disappearance of a person he had interacted with.

He said: “Has f***ed off, the useless c**t.”

It’s unknown who the furious Fury was talking about in the video, which has spread like wildfire on social media.

Boxing fans were quick to comment, with one saying: “He’s rattled. He knows the jig is up.”

Another said: “Fury feeling the pressure.”

And another said: “Rattled when the cameras were off him.”

Anthony Joshua knocked out Francis Ngannou in the second round of their Saudi showdown.

One remarked: “He is FUMING.”

Another chimed in: “Running around in a waistcoat with no shirt, a dyed beard calling people useless cunts is quite an image.”

Joshua, 34, did his part to get a Battle of Britain between himself and Fury back on track with his destruction of Ngannou.

Fury must now register back-to-back wins over Oleksandr Usyk in their undisputed fights later this year to ensure the fight happens.

He said: “I’m sure Oleksandr Usyk will have something to say something about that.

“I had a s*** performance against Ngannou. AJ did absolutely fantastic and lit him up with a right hand.

“If he fights me after I beat Usyk twice then it will be a different game.”

Joshua, however, refused to be drawn on a historic domestic dust-up with his long-time rival, telling iFL TV: “F**k Tyson Fury.”

Anthony Joshua overpowered Francis Ngannou and didn’t stay around.