Anthony Joshua celebrated finding out for sure who he will be fighting in New York by taking out his frustrations on the pads.

No sooner was Andy Ruiz Jr confirmed as his replacement world heavyweight title challenger on June than his trainer felt the force of his champion in Sheffield.

Joshua, already as lean as he has been feeling mean more than a month before his US Debut, let rip with flurries of thunderous punches which left Rob McCracken gritting his teeth and shaking the aftershocks from his arms.

Anthony Joshua poses for the camera during his open workout at the English Institute of Sport

The Englishman showed off his s𝓀𝒾𝓁𝓁s after announcing his next will be against Andy Ruiz

Joshua left trainer Rob McCracken (L) gritting his teeth as he let rip with some fierce punches

Drugs cheat Jarrell Big Baby Miller might consider himself fortunate that he fell foul of those three drugs rather than being flattened in the Madison Square Garden ring.

After his short work out and a swirl of interviews and pictures, Joshua will be embarking for New York on Sunday.

After a similar media day there on Monday, he flies on to a warm weather training camp in Miami, before returning to the Big Apple for fight week.

Joshua and McCracken believe Ruiz will provide a ‘sterner test than Miller.

The 29-year-old will defender his WBA, IBF, WBO and IBO titles at Madison Square Garden

Joshua performed a short workout for the media before he embarks for New York on Sunday

The Brit knows only an emphatic victory will be enough to please fans in this upcoming bout

Joshua v Ruiz will be televised live on Sky Sports Box Office late on Saturday night June 1.