Anthony Joshua has told Sky Sports News that he is unconcerned with the threat offered by IBF heavyweight champion Charles Martin.
Last weekend, it was announced that Olympic gold medallist Joshua would fight for the American's world title in just his 16th match as a professional.
Despite Martin being crowned world champion due to an injury sustained by Vyacheslav Glazkov, some have questioned whether Joshua is ready to compete at the highest level at this stage of his career.
However, the 26-year-old has said that he holds no fear ahead of the huge clash at London's O2 Arena on April 9.
Joshua said: "There's no fear with me, no fear. I'm here, there is no turning back.
"I can't be worried. We had the opportunity to take the fight. I took it, so why would I be worried? I have to say he's wrong when he sees fear in my eyes.
"I think he's going to come game. April 9 will be explosive, myself underdog, him the champ, it's a great match-up."
Joshua has been declared a huge favourite with the bookmakers after stopping all but one of his previous 15 opponents inside three rounds.
In his most recent bout on December 12, the Watford-born puncher endured an uncomfortable second round against rival Dillian Whyte before recovering to stop his opponent in the seventh round.
Martin is unbeaten in 24 outings but he, like Joshua, has rarely been involved in competitive fights.