Derek Chisora has told talkSPORT he is in regular contact with Anthony Joshua from his training camp to face Tyson Fury.Joshua is preparing for the biggest fight of his career, a settling of his decade-long heavyweight rivalry with Fury on December 11 in Cardiff.Chisora is one of millions of Brits excited to see Fury and Joshua fight years in the making in DecemberGettyAJ has turned back to previous trainer Ben Davison, who has also coached Fury, with the former Olympian training in Essex alongside Fabio Wardley.His promoter Eddie Hearn has teased that it has been an exhilarating camp with no stone left unturned in the pursuit of ultimate bragging rights.And British heavyweight fan-favourite Chisora, who is friends with Joshua, has revealed the pair have been holding regular phone calls.He told talkSPORT: “I speak to him every Friday after his week of training camp.“I send him a message asking him how it was, and he said ‘yeah I’m killing it’.“So that is all I need to know, he’s killing it. Whatever happens it is going to be an exciting fight on December 11.”Chisora’s verdict on Joshua vs FuryThere is no-one better placed to talk about the fight than Chisora, given his intel from Joshua’s camp.Chisora has also shared the ring with Fury three times, so is well versed in what to expect in the ring from the ‘Gypsy King’.And despite being now at the twilight stages of their careers, the 42-year-old believes it is still happening at a perfect time.Chisora is confident in Joshua’s camp, but believes he must beat Fury inside the first six roundsBut he thinks for Joshua to win, he must use his power to end the fight as early as possible.He continued: “I am so excited about it. We are not getting it too late, it is at at the right time.“Both fighters have something to prove still in the ring. AJ has to knock him out in the first six rounds.“After that it is a long night, but AJ has the power to knock out Tyson any round.“But has Tyson got that same power? No. However, what Tyson will do is make the fight at a higher pace.“He has the endurance to sustain it for 12 rounds, and throw a higher volume of punches.“So it will be interesting and I’m very excited, especially if Dana White is involved and at the top table.”Watch Boxing on DAZN*If you click a link in this boxout, we will earn affiliate revenueSign up to DAZN to access the definitive subscription for boxing fans.Upgrade to DAZN Ultimate from just £24.99/month, guaranteeing access to 185+ fights annually, a minimum of 12 pay-per-views at no extra cost, as well as every Lega Serie A match and other elite football access.Alternatively, DAZN Standard is just £15.99/month, with the caveat you will have to pay for pay-per-view events.Click here to sign up.Fury and Joshua’s blockbuster clash is generating huge excitement, with the bout to be watched by Chisora and millions around the world.80,000 fans will also flock to the Welsh capital to watch the event live, with a British record gate attracted.The winner of the fight will also now receive the WBA world title, raising the stakes further for the clash which is billed as the biggest in British history.