CNBC said Bloomberg reported the news, citing trade publication Reorg Research.
CVS Health Corp and Aetna announced the $69 billion deal on Dec. 3 last year, arguing it would enable the companies to tackle soaring healthcare spending by offering lower-cost medical services in pharmacies.
Aetna and CVS declined to comment.
(Reporting by Manas Mishra in Bengaluru; Editing by Saumyadeb Chakrabarty)