Toshiba Corp. has chosen additional banks to help it evaluate takeover interest, as Blackstone Inc. explores teaming up with KKR & Co. on a joint bid for the Japanese conglomerate, people with knowledge of the matter said. 

The Tokyo-based company plans to bring on JPMorgan Chase & Co. and Mizuho Financial Group Inc. to work alongside Nomura Holdings Inc. as it weighs strategic alternatives including a privatization, the people said. Toshiba could announce the appointments as soon as this week, according to the people, who asked not to be identified because the information is private. 

CVC Capital Partners and Bain Capital have also been weighing potential offers for Toshiba, Bloomberg News has reported. CVC is speaking to several buyout firms as well as local Japanese funds, including some with state backing, about joining forces, the people said.

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