The state-run explorer Oil and Natural Gas Corp is "not passive" to Vedanta Resources' up to $9.6-billion offer to take control of Cairn India, its chairman RS Sharma said on Thursday.
ONGC has a 30% stake in Cairn India's oil block called RJ-ON-901 in Rajasthan.
India's trade minister said last month ONGC should have a say in the deal.