Former WBA heavyweight champion David Haye has grown tired of waiting for a challenge from either of the Klitschko brothers to arrive.
Haye, 32, announced his comeback at a press conference in London on Thursday and will fight an as-yet-unnamed opponent at Manchester Evening News Arena on June 29.
He also expects to fight again later this year to put himself in a mandatory position to face either Vitali or Wladimir Klitschko for their respective titles at some stage in 2014.
"Instead of sitting around and waiting another year I want to get back in there," Haye said.
"I'm happy to be back - a year is long enough time to wait for someone to phone you."
Haye's own promotional company, Hayemaker, will promote his comeback fight in June and his trainer Adam Booth confirmed talks are ongoing to find a suitable opponent.
"David will fight an opponent who I am yet to secure, but who will be highly ranked," said Booth.
"He wants to fight twice this year against highly-ranked contenders to put himself in an unavoidable position to be the mandatory contender to one of the brothers. He is not waiting anymore. He is fighting his way into position."
Haye was last in the ring last July when he defeated fellow British heavyweight Dereck Chisora at Upton Park, a bout he thought would lead to an encounter with WBC champion Vitali Klitschko.
Vitali's brother Wladimir beat Haye in Hamburg in 2011 to add the WBA title to his IBF, WBO and The Ring crowns and now Haye wants another shot at one of the Ukrainians.
"I want that heavyweight title back," he said.
"I was hoping Vitali would be a man of his word and fight me after I did what he and his team wanted me to do and beat Dereck Chisora."
"We have been sitting around, waiting for the phone to ring but that hasn't happened. We have sent some e-mails but they have fallen on deaf ears."
Vitali will face unbeaten Manuel Charr in September, with Francesco Pianeta next up for Wladimir.