Kundra and Shilpa have denied allegations against them.
Police sources said they may quizz Kundra again and call Shilpa for questioning if there is a need.
The names of Kundra, who was questioned for 11 hours two days ago by police claiming that he had confessed to betting, and Shilpa, came in a statement recorded by his business partner Umesh Goenka, a bookie, during investigations into IPL spot-fixing scandal.
Police sources said Kundra had claimed during questioning that he lost Rs 50 lakh in betting during IPL IV season, Rs 40 lakh in IPL V and Rs 12.5 lakh in the just concluded IPL VI.
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"We do not buy this argument. He had told us that he placed bets on matches played by Rajasthan Royals. In this season, his team won 11 out of the 16 matches it played and it is hard to believe that he lost money in betting," a senior police official said.
Kumar denied allegations that Kundra was given special treatment by police.
Asked about Delhi Police not invoking Gambling Act like its Mumbai counterparts which charged Vindoo Dara Singh and Gurunath Meiyappan, he said they do not have supporting evidence to arrest Kundra.