government sources said amid reports that his lawyers told a UK court that India had no evidence against him.
"The fact remains that there is, prima facie, a very strong case in terms of the UK's Fraud Act 2006 against Mallya," a source in the government said.
He said news reports from London had suggested that there was no evidence to support the government's case against Mallya and that his lawyer had torn into the government's extradition plea.
The 61-year-old liquor baron, wanted in India on charges of fraud and money laundering allegedly amounting to around Rs 9,000 crore, was in the dock at Westminster Magistrates' Court for his defence, headed by barrister Clare Montgomery, Tuesday.
"The conduct of Vijay Mallya, especially before the Supreme Court and other courts, was also highlighted to drive home the fact that Mallya has to answer about his dishonest intentions in the contempt proceedings against him in the Supreme Court of India," he said, quoting proceedings in the Westminster Magistrate's court.
Mallya, who was arrested by Scotland Yard on an extradition warrant in April this year, has been out on
bail on a bond worth 650,000 pounds.
Union Minister of state for Home Kiren Rijiju last month held a discussion over Mally's extradition with visiting UK Minister of State for Immigration Brandon Lewis.
Samirbhai Vinubhai Patel was the first to be extradited from Britain to India in late 2016. He was wanted in connection with the 2002 post-Godhra riots in Gujarat.