Panasonic Corp plans to sell three chip-assembly plants in Southeast Asia to Singapores United Test and Assembly Center Ltd, sources familiar with the matter said on Friday, as part of Panasonics global reorganization. Panasonic aims to conclude a deal by early February, but final details including price have yet to be agreed. The company is also considering what to do with two other chip assembly plants in Shanghai and Suzhou, China, the sources added, saying Panasonic may sell or could close those plants. A Panasonic spokesman said only that the company was considering various options and that nothing had been decided.