"There is a growing likelihood that Toshiba will become unable to fulfil its financial obligations in a timely manner or will undertake a debt restructuring we classify as distressed in the next six months," S&P said. Toshiba's multi-billion-dollar losses are likely to multiply, it added, as it faces the embarrassing prospect of being delisted from the Tokyo Stock Exchange. "The heavy losses and financial burden related to Toshiba's US nuclear power business will grow further, increasing uncertainty about (its) prospects for restructuring and bank support," S&P said. The downgrade comes after Toshiba's beleaguered shares rebounded earlier Friday, closing 3.5 per cent higher, on reports that Tokyo is mulling using state money to support the spin off of its prized memory chip business. The government denied the reports. "The specifics of its plan to sell its (memory chip) business have yet to be determined and it will be some time before the proceeds of a sale materialise," S&P said.