The first batch five Rafale aircraft had landed at the Air Force Station in Ambala from France on July 27.
The Rafales are armed with Meteor beyond visual range air-to-air missile (BVRAAM) and Scalp cruise missile.
The first squadron of the aircraft will be stationed at Ambala air force station, considered one of the most strategically located bases of the IAF.
Nambiar, who reached Paris four days ago, flew the aircraft in France to assess its efficacy.
Sitharaman's response, in a written reply, came to a question by Samajwadi Party Rajya Sabha member Naresh Agrawal seeking to know why the government was not disclosing details of the deal.