South Korea has failed to make it into Citigroup's closely tracked World Government Bond Index (WGBI), a finance ministry official said on Monday.

The ministry's FX market division director, Kim Yi-tae, told Reuters it was checking on details behind the index compiler's decision and expected South Korea to be reviewed again for possible inclusion in the index in September.

(Reporting by Chang Tae-min and Kim Yeon-hee; Editing by Jonathan Hopfner)