The Daily Star's FREE newsletter is spectacular! Sign up today for the best stories straight to your inboxJoe Joyce insists his trainer's Covid-19 shock won't wreck his hopes against Daniel Dubois tomorrow night (SAT).The Juggernaut will not have head coach Ismael Salas in the corner after the Cuban tested positive for coronavirus this week.But the British, Commonwealth and European heavyweight title fight has been saved by the fact Salas has spent the last four weeks in Las Vegas.Starsport revealed on Wednesday that the trainer had jetted back to the US to train two other fighters at the end of October.He arrived in the UK on Saturday but was isolated from Joyce and his camp in case he would test positive.Steve Broughton, who worked the.