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Overseas investors bought Indian equity derivatives worth 41.22 billion rupees ($677.4 million) on Tuesday, NSE data shows.
The amount included 28.53 billion rupees worth of index options.
"This kind of buying in Nifty options happened in March and April and is pointing towards a big move on the long side even from record highs," says a derivatives analyst at a foreign broker.
Data shows 2 million August put contracts added for NSE at 7,900 level.
Concentration of put contracts has also shifted from 7,600 to 7,700 for the August series, implying a support around 7,700 levels.
Data also shows 1.4 million call contracts added at 8,000 level and 0.9 million for 8,100 August strike.
