Harrison won gold at the Sydney Olympics in 2000

The 35-year-old suffered his third defeat after being knocked out by Sprott at Wembley Arena, prompting speculation that he might retire.

"The papers and critics are out in force and I can almost see their point that my career appears over.

"But we are talking about me and maybe I'm delusional or crazy, but I feel determined to rectify this," he said.

Will it be as the papers say or will I rise from the ashes? Audley Harrison

"I've heard comments made by Frank Warren and others regarding my ability to attract an audience in the future.

"But I am sure the paying public will be curious to see this crazy guy whose career is effectively over, trying to kid himself, getting in there with nothing left but ego and fool's pride.

"And the question is - how will it end? Will it be as the papers say or will I rise from the ashes once more to deliver on my promises?"

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Former Olympic champion Harrison has already targeted a rematch with Sprott as the first step in his salvation.

However, that fight is unlikely to happen this year as Sprott is scheduled to meet Matt Skelton on 26 May in a world title eliminator.

"Despite Michael Sprott saying no rematch, we all know how the business works, and if it makes commercial sense, I'm sure we will fight again," added Harrison.