New Delhi, Dec. 16 -- India's key equity indices are expected to open largely flat on Tuesday as investors remain cautious amid ongoing foreign fund outflows and a weakening rupee, while uncertainty persists over a potential trade agreement with the U.S.

Gift Nifty futures were trading at 26,035, suggesting the Nifty 50 is set to open close to Monday's closing level of 26,027.3.

Both the Nifty 50 and the Sensex have traded in a narrow range over the past fortnight after scaling record highs on December 1, weighed down by the absence of fresh catalysts and continued anticipation of an India-U.S. trade deal.

On the Nifty options front, Chandan Taparia, Head Derivatives & Technicals, Wealth Management, Motilal Oswal Financial Services Ltd...