The logo of Toshiba Corp is displayed atop of the company's facility building in Kawasaki, Japan, June 24, 2022.
JIP's initial offer was below 6,000 yen per share, the two sources told Reuters, putting the value of a potential tender offer at less than 2.6 trillion yen ($17.5 billion).
Investors have considered 6,000 yen to be a key threshold.
During a strategic review last year, at least one global private equity firm told Toshiba's review committee that a deal to take the conglomerate private could be done at 6,000 yen a share or more.
In Japan, the court-led rehabilitation of auto parts supplier Marelli Holdings Co Ltd - owned by U.S. private equity firm KKR & Co Inc (KKR.N) - has turned banks cautious about terms for financing leveraged buyouts, private equity sources said.