Sept 21 (Reuters) - British real estate portal Rightmove ( RTMVF )

has rejected an improved takeover offer from Australia's

REA Group ( RPGRF ), majority-owned by Rupert Murdoch's News Corp ( NWSA )

, Bloomberg News reported on Saturday.

Rightmove ( RTMVF ) views the sweetened bid of nearly 750 pence a

share, or a total of about 5.9 billion pounds ($7.86 billion),

as undervaluing the company, Bloomberg said, citing people

familiar with the matter.

The sweetened deal, which was first reported by the

Financial Times on Friday, came after Rightmove ( RTMVF ) rejected a $7.32

billion buyout offer on Sept. 11, deeming it an undervaluation

of the company's prospects.

A potential takeover by REA could boost the firm's

growth in lucrative international markets, according to

analysts, as Britain's housing market is considered to be triple

the size of Australia's.

Rightmove ( RTMVF ) declined to comment, while REA did not

immediately respond to Reuters' request for a comment.

($1 = 0.7507 pounds)