KKR & Co, Fountainvest Partners and PAG are among buyout firms interested in acquiring a stake in Starbucks' China business, four sources said, as the U.S. coffee chain looks to revive flagging sales in its second-largest market.

Starbucks (NASDAQ: SBUX) is reportedly exploring the sale of a stake in its China business as it grapples with declining sales in its second-largest market. Private equity giants KKR Co (NYSE: KKR), Fountainvest Partners,

Starbucks (NASDAQ:SBUX) is reportedly exploring options to sell a stake in its China business, with several buyout firms and Chinese companies showing interest. Sources told Reuters that KKR & Co (KKR),