LONDON – British boxer Amir Khan defended his link-up with American drugs cheat Victor Conte ahead of his fight with Mexico’s Julio Diaz on Saturday.Conte was jailed in 2005 after pleading guilty to conspiracy to distribute banned steroids and his association with Khan has been criticised by UK Anti-Doping.However, Khan said the controversial American, who was introduced to the boxer by trainer Virgil Hunter, had passed on a lot of invaluable tips."The advice he’s been giving me has been brilliant,” Khan told the BBC’s website. "I know he’s had a bad background and has done things he shouldn’t have."Virgil Hunter is my trainer and he’s the one who’s told me we are going to use Victor Conte as an assistant in a way, as he has a team of trainers who can teach you stuff."On the training methods he’s brought so much good training into the game. He’s introduced me to a lot of new trainers who have helped me on my running, sprinting, on my engine really, which is working my fitness, also breathing methods and telling me what to do and what not to do.”Conte was at the centre of the BALCO doping programme which included several high profile athletes like Marion Jones and Tim Montgomery.