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The 28-year-old ended his career with a record of 18 wins, five losses and two draws, with just a week to go until his next fight.
He was supposed to be on the undercard of the Conor Benn vs Sebastian Formella bill next Saturday but instead decided to announce his retirement.
Writing on Instagram, the Doncaster boxer said he didn't "want to get punched anymore" and that all he wants is "a nice quiet life with a wife and some kids healthy and happy getting nice and fat."
Allen went unbeaten in his first nine fights before losing to Dillian Whyte and Luis Ortiz in back-to-back fights in 2016.
A win against former WBA (regular) champion Lucas Browne in April 2019 was the highlight of Allen's in-ring career and led to a big British fight against David Price.
For many the 'Doncaster De La Hoya' was the favourite going into that fight, with Price having shown inconsistent form before their meeting, but the Scouse boxer won with a 10th round stoppage.
Allen recovered from that fight to beat Dorian Darch in February this year, in somewhat controversial circumstances, but decided against another night at Wembley Arena next week.
As well as his retirement, Allen also posted a video of him sparring with Usyk recently, which might have been one of his last occasions in the ring.
The Brit takes a huge shot from the Ukrainian former cruiserweight champion as he walks onto it with his hands by his side.
Allen explained that despite not hitting the deck he was knocked out.
Eddie Hearn put it best replying, "Only you would keep your hands by your side sparring with the undisputed champ."
Usyk's win over Dereck Chisora keeps him as the number one contender for Anthony Joshua's WBO world title.
Featured Image Credit: Instagram
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