Australian boxing world champion Daniel Geale is set to announce the biggest fight of his career, a Las Vegas title bout on New Year's Eve for a half-a-million-dollar purse. Geale says he is "90%" certain his next bout will be a unification battle with WBO middleweight champion Dmitry Pirog of Russia.

The Tasmanian, who holds the IBF middleweight crown, told Hobart's Mercury his management was close to securing the prestigious date.

"We have spoken before but today it seemed as though things were starting to move along and things are happening," he said. "It is a bit exciting.

"(It's) nearing 90%, the way my management are speaking about it. They asked me straight 'What do you reckon?' and I said 'Let's do it'."

Pirog boasts an imposing 19-0 record with 15 wins by knockout, while Geale's record is 26-1. Geale could have earned $1 million in the US in his first world title defence but famously passed it up to stage the event in Hobart in August.