India's software services sector will see revenue growth of 7-9 percent in constant currency terms in the fiscal year to March 2019, a leading lobby group forecast on Tuesday.

"The current outlook is one of cautious optimism," said R. Chandrashekhar, president of the National Association of Software and Services Companies (NASSCOM), in a statement.

"There is still some turbulence and it is not clear how some of the known uncertainties will play out, however FY 2019 is likely to be a better year, based on our current assessment".

The country's $154 billion IT sector has been mired in worries about U.S. visa measures, as well as a broader slowdown in technology spending among other factors.