Anthony Joshua has revealed how he delivered a chilling warning to Wladimir Klitschko during the sixth round of their heavyweight classic at Wembley Stadium.

AJ picked himself up off the canvas to triumph in front of 90,000 people but could be seen in the mid rounds mouthing trash talk at Klitschko.

A fatigued Joshua has now admitted the verbals were part of Klitschko's downfall after warning him about a resurgence if he failed to put the Brit away.

"I was talking to him and I just told him, 'If you let me get through this round, I'm gonna f*** you up,' and he said, 'I'm going to knock you out' - It's competition talk," Joshua said on a Under Armour Facebook Live hosted by Colin Murray.

Joshua regrouped in rounds 7-10 before finding the energy to unleash an explosive uppercut that took the wind out of Klitschko's sails.

Two knock-downs followed before AJ pinned the Ukrainian on the ropes to force the fight to be waved off and the former Olympic champion has described his elation at realising victory.

"I knew these two rounds were vital I knew it was close," Joshua added. "I stepped it up, boom boom boom boom.

"Subconsciously, I don't know where it came from, I just whipped it up and saw his chin... It was like an exorcism where he's looking at the back of the crowd."

'I'm going to f*** you up' - Anthony Joshua reveals chilling warning to Wladimir Klitschko at Wembley Stadium