The consortium proposing to take Seven & I Holdings private has tapped Citigroup and Bank of America for financing, adding to a growing group of players in the potentially record-breaking management buyout bid, people familiar with the matter said.

The two U.S. banks’ role in the bid would be to refinance the debt of Seven & I’s U.S. unit, one of the people said. The company had debt of ¥2.7 trillion ($17.8 billion) as of November, 56% of which belongs to the overseas convenience store operations, according to the company’s financial results. Banks typically pass on such debt to outside investors.

Thai conglomerate CP All — which holds the Thai franchise for 7-Eleven — is also weighing plans to take an equity stake in the management buyout of about ¥500 billion, the people said, joining a plan hatched by Seven & I’s founding Ito family and Familymart operator Itochu last year.