Japan's Panasonic plans to buy the shares it does not already own in Sanyo and another unit, four sources said, in a deal that could top $USUS10 billion and strengthen its push into greener businesses. Panasonic plans to raise up to 500 billion yen ($US5.7 billion) in a new share issue to help it finance the buyouts, two sources said, weighing on the company's share price. As the world's No.4 flat TV maker speeds up a restructuring, four sources with knowledge of the matter said Panasonic would buy the remaining shares in Sanyo Electric Co and Panasonic Electric Works Co. The move is key to Panasonic's strategy of shifting focus to energy and environment-related businesses as it struggles to boost profits in overseas markets amid tough price competition from South Korea's Samsung Electronics and LG Electronics. It has said it would withdraw from overlapping business with Sanyo.