Ngannou is renowned for his terrifying knockout power and holds the record for the hardest punch in the world that registered his one-hit power at an astonishing 129,161 units.

Now he has taken the opportunity to demonstrate his incredible power again ahead of his contest with Joshua by showing off on a punch machine in a gym.

Francis Ngannou has delivered a brutal warning to Anthony Joshua ahead of their upcoming fight

Ngannou unleashed a huge right-hand on a punch machine ahead of his clash with Joshua

Ngannou is renowned for his terrifying knockout power and holds the record for the hardest punch in the world

Ngannou shared a video of himself striking the machine that see’s him keep both feet stationary before pulling back his arm a short-distance in the build-up to delivering the huge blow.

The 37-year-old then connects with the punchball and rattles the machine with the power of his right-hand strike.

The digits on the scoreboard immediately begin to soar and quickly maxed out at 999 in recognition of Ngannou’s effort.

Joshua will have to be wary of getting hit by Ngannou’s dominant hand amid fears that the Cameroonian could knock out his English opponent.

The strength of Joshua’s chin has been tested in previous clashes and was wobbled by the lighter-framed Usyk in both of his title fights with the Ukrainian.

Joshua believes he will knock Ngannou out when the pair fight in Saudi Arabia in March

The former heavyweight holder previously hailed Ngannou’s power, but admitted his confidence in knocking the ex-UFC star out.

‘We knew Francis had a reputation as the biggest puncher in the world but the surprise was how well he boxed.

‘These are notes I’ve already made about him. His style, where he’s dangerous, where he might get caught. By fight night I’ll go into the ring knowing everything about him.

‘All I need to know about getting another f***ing knock out,’ he added.