The two kidney recipients, Santosh Kumar Gupta (54) and Ashok Aggarwal (63), were arrested on April 4 and 11 respectively, they said.
They were on anticipatory bail and were formally arrested for the purpose of finalising the supplementary chargesheet, a senior police officer said.
The kidney racket at a private hospital in southeast Delhi was busted in June last year and 17 persons were arrested in that case.
Police had claimed that some personal staff of doctors at the hospital were running a kidney racket and bringing donors from different parts of the country to Delhi.
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Kumar had paid Rs 3 lakh to T Rajkumar Rao, the alleged kingpin of the racket and around Rs 8 lakh towards medical expenses. Aggarwal had paid Rs 2 lakh to Rao.
Kumar had come into contact with Rajkumar through Brijesh Chauhan, the PA of Dr D K Agarwal.
Ashok Aggarwal had come in contact with Rajkumar through Shailesh and Aditya, PAs of Dr Ashok Sarin.
Gupta was earlier running a sweet shop while Aggarwal has a garment shop.
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