Anthony Joshua warned one factor could see him lose to Jake Paul

Anthony Joshua takes on Jake Paul next Friday in a fight which has sparked controversy given the disparity in ability between the ex-world champion and the YouTuber

Anthony Joshua has been warned he must be switched on to avoid an embarrassing defeat by Jake Paul .

Joshua takes on Paul next Friday in a sanctioned heavyweight contest which has sparked controversy given the disparity in ability between the ex-world champion and the YouTuber. Joshua has not fought since he was knocked out by Daniel Dubois at Wembley 15 months ago.

He sees his meeting with Paul as a tune-up for a serious return to action in Saudi Arabia in February before a showdown with long-time rival Tyson Fury next September. Social media star Paul, meanwhile, has built a career by fighting ex-MMA stars and last