TOKYO (Reuters) - American International Group Inc, plans to sell its three Japanese life insurance businesses, an AIG spokesman said on Saturday, in a sale Japanese media estimated could top $9.5 billion.

AIG, once the world's largest insurer, said on Friday it will focus on its main insurance operations and put the rest of its businesses up for sale to repay up to $85 billion borrowed from the US government.

As part of such efforts, AIG intends to sell shares in American Life Insurance Co (ALICO), AIG Star Life Insurance Co and AIG Edison Life Insurance Co, said Fumiyasu Sato, a Tokyo-based spokesman for AIG.

ALICO operates as a life insurer in more than 55 nations and regions including Japan, while AIG Star Life and AIG Edison Life are AIG life insurance units based in Japan.

Sato added that AIG has no intention of selling its nonlife insurance operations in Japan.

AIG received a US federal bailout last month after losses in its financial products unit drove it to the brink of collapse.

Japanese business daily Nikkei said on Saturday the price for the sale could top 1 trillion yen ($9.5 billion) combined, and added that a number of major Japanese and overseas insurance companies may be interested in acquiring the businesses being put on sale.

Because of the size of the businesses, domestic life insurers may form an alliance to make the purchase, Nikkei said.