Ukrainian boxing star Vitali Klitschko says he might only have one or two more fights in him before he gives up a glorious career in which he dominated the sport alongside his younger brother Wladimir.

"I am now finishing my sports career," the 40-year-old told Ukraine's TVi television. "I will have one more fight, maybe two at most."

But Klitschko urged his fans not to despair because he fully expected his 35-year-old brother to stay in the ring for years to come.

"Wladimir is five years younger and he will continue delighting you with his fights for a long time," the WBC heavyweight champion said.

The imposing Ukrainian has 43 victories from 45 fights in a professional career that began in 1999.

He has recently focused his attention on Ukrainian politics and, last year, founded the opposition Ukrainian Democratic Alliance for Reform (UDAR) - an acronym that means "punch" or "strike".

Klitschko has also emerged as one of the most prominent Ukrainian supporters of the former Soviet republic's jailed ex-prime minister Yulia Tymoshenko.

The elder Klitschko - already a deputy on the Kiev city council - said Wladimir had recently also asked to join his political party.