Sony is planning to invest ¥50bn ($642m) in troubled medical and photographic company Olympus, according to news agency Reuters. The report says three sources have confirmed Sony approve a move to take a 10% stake in Olympus, which is still reeling from the revelations that its executives covered-up $1.7bn of loses dating back to the 1990s. The report comes a day after former Olympus Chairman Tsuyoshi Kikukawa and two other former executives pleaded guilty to fraud charges relating to the cover-up.

Olympus has issued a statement saying it has not made any annoucement yet and will do when there is a development.