'I have NEVER knowingly taken any banned substance': Jarrell Miller shocked at failed drug test which put Anthony Joshua's US debut in doubt Jarrell Miller was due to fight Anthony Joshua but failed drug test on March 20 'Big Baby' tested positive for banned substance that improves endurance He posted on Instagram denying that he knowingly took illegal substance AJ is still pushing on with plans to fight in New York on June 1 this summer By Will Griffee For Mailonline Published: 09:34 BST, 18 April 2019 | Updated: 09:50 BST, 18 April 2019 Viewcomments Jarrell Miller says he has 'never knowingly taken any banned substance' and intends to appeal against the decision to revoke his licence following an adverse doping test. Miller, who was due to fight British heavyweight Anthony Joshua in his native New York on June 1, produced an adverse result for a metabolic modulator in testing carried out on March 20 by the Voluntary Anti-Doping Association (VADA). He retains the right to request another sample be tested and to reapply for a licence, and has now stated his intention to 'vigorously appeal' against the decision. Jarrell Miller posted this picture on Instagram along with a lengthy denial of knowing use WHAT IS GW1516? GW1516 was developed in the 1990s as a treatment for diabetes, obesity and cardiovascular disease. It works by forcing skeletal muscle to use fat rather than carbohydrates as an energy source. While it is used by some to accelerate fat loss, it also has real benefits as an endurance aid for athletes. The substance was added to the World Anti-Doping Agency's banned list in 2009 and forces the body to use fat instead of carbohydrates for energy, aiding endurance. 'I am absolutely devastated upon hearing the news my boxing licence has been revoked in NY State and I will be vigorously appealing this decision,' Miller wrote on Instagram. 'I have NEVER knowingly taken any banned substance and when I found out the news last night I was totally shocked. 'My team and I stand for integrity, decency & honesty and together we will stand to fight this with everything we have!' Joshua's camp are still working towards a fight at Madison Square Garden on June 1, with Matchroom chief executive Frank Smith stating on Wednesday night that his organisation were 'looking at other potential opponents'. Anthony Joshua (left) is actively looking for an opponent to replace Miller on June 1 HIS FIVE POTENTIAL OPPONENTS Luis Ortiz - 31 wins, 1 defeat Adam Kownacki - 19 wins, 0 defeats Kubrat Pulev - 27 wins, 1 defeat Michael Hunter - 16 wins, 1 defeat Manuel Charr - 31 wins, 4 defeats Miller continued: 'This was a voluntary test that I was very happy to do and these results came just one week after another voluntary test that I had taken which was completely clean. 'I refuse to just lie down and let my dream be taken away from me when I know in my heart that I've done nothing wrong. 'Fifteen years of hard work. I'm a WARRIOR .. I don't need a banned substance. 'Remember, don't believe everything you hear and see. The facts will prevail and I shall be vindicated. I don't have anything to hide and the truth will make itself known.' Sportsmail understands a shortlist of five names that includes Adam Kownacki, Luiz Ortiz, Kubrat Pulev, Michael Hunter and Manuel Charr has hastily been put together for the Madison Square Garden bout. Miller said he will continue to fight and will not allow his dream to be taken away from him Joshua's promoter Eddie Hearn said: 'I spoke to AJ on Tuesday night. It's not an ideal situation and we have to wait and see what happens with Jarrell. 'If he is unable to fight, AJ will still be fighting June 1 in Madison Square Garden. 'He has told me he will fight absolutely anyone and so we are looking at our options right now. Everyone will want a shot at the titles and so we have plenty of options to consider.' The news is a massive blow for Joshua who is trying to raise his profile across the Atlantic. The fight with Miller had broken sales records for Madison Square Garden, taking just two hours to become the highest-grossing pre-sale there ever. Now he faces the prospect of taking on a more obscure opponent, less well known to American audiences. Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility