Infosys BPO Ltd, the business process outsourcing subsidiary of Infosys Technologies, expects revenue to

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rise 10 to 15 percent in the year to March 2010 but pricing is under pressure, its chief executive said.

"Clients are under pressure anyway so they are putting pressure across the board," Amitabh Chaudhry told Reuters in an interview.

He said the outsourcing business environment would remain uncertain for the next 12 to 18 months as western clients struggle.

"Maybe we are near the bottom, how long we will remain at the bottom God only knows."

India's back-office outsourcing firms like Infosys BPO have so far thrived by providing Western firms with services such as processing insurance claims, managing payrolls and customer support.

The boom in business process outsourcing, or BPO, is built on a large, skilled and cheap English-speaking workforce, but a global economic slowdown has crimped spending by global corporations.