"I am ready. I have my legal briefs ready," Rahul Khullar told Reuters, without saying when India could present a case.
New Delhi says it wants to solve the dispute "amicably" but there has been no breakthrough so far between India and its largest trading partner. Khullar said India was still holding out for a solution.
Khullar also said the Doha world trade talks were "standing still" and India was waiting for the United States to move the talks forward.
A formal trade dispute has loomed for a long time between India and Brazil on the one side, and the EU on the other.
Developing countries believe the case, originally involving the seizure by Dutch customs of a blood pressure drug en route from India to Brazil, is a symbol of their mistreatment by rich nations and corporations.
India has said the drug shipments were consistent with WTO regulations. (Reuters)
