"If he is going to get macho and start wanting to tear up with him, then Parker is a very dangerous guy, very fit, and he is on you all the time," Bruno added.
A gigantic unification fight with Deontay Wilder beckons for Joshua if he remains unbeaten and Bruno thinks the dedicated former Olympian deserves everything coming his way.
Joshua already possesses the WBA, IBO and IBF titles and would add the WBO belt to his collection by beating Parker.
With just under a fortnight until their fight at Cardiff's Principality Stadium, anticipation is building before reaching a crescendo in the Welsh capital on March 31.