Satoshi Takamatsu, a Japanese businessman, was gearing up to go to space after signing a contract to undergo training but said today that he was not ready for the launch expected in early September.
"The Russian commission has proposed sending a national of Kazakhstan to the ISS," spokesman for the Russian space agency Roscosmos, Igor Burenkov, told AFP.
Burenkov said Russia had to agree the plan to send Kazakh pilot Aidyn Aimbetov into space with its ISS partners before making a formal announcement.
"I will wait until the moment is right for me," Takamatsu was quoted as saying in a statement by space tourism agency Space Adventures.
Also Read
He said that the art projects he wants to pursue in space require more time.
"We hope that he realises his dream of launching to space in the next two-four years," Space Adventures president Tom Shelley was quoted as saying in the statement.
Last month, Brightman, known for her roles in West End musicals such as "Phantom of the Opera," announced she had to pull out of preparations for family reasons.
The space agency of Kazakhstan declined comment today.
Aimbetov would be joining Russian cosmonaut Sergei Volkov and Andreas Mogensen of the European Space Agency, who will be the first ever Danish national to go into space.
Previous space tourists visiting the ISS on a total of eight trips have included the Canadian founder of the Cirque du Soleil, Guy Laliberte, and Iranian-American entrepreneur Anousheh Ansari, the only woman so far.