British outsourcing group Serco is in talks about buying Blackstone's controlling stake in India's Intelenet Global Services, the Financial Times reported on Tuesday.

There was no guarantee that a deal would be reached with the U.S. private equity group over its 66 percent stake, according to the FT.

The FT said Serco, which runs a diverse range of public services including London's cycle-hire scheme and Dubai's metro, is seeking to make a further push oversees despite a slowdown in its domestic market.