SEOUL (Reuters) - Samsung Group said on Thursday its de facto leader Jay Y. Lee would sell a stake of 2.05 percent in Samsung SDS Co Ltd (>> Samsung SDS Co Ltd) for about 380 billion won ($315 million) to raise money for any potentially unsubscribed shares he will need to buy from the rights issue of Samsung Engineering Co Ltd (>> Samsung Engineering Co Ltd).

Samsung Group said last year Lee would buy up to 300 billion won worth of shares to be sold by Samsung Engineering Co Ltd <028250.KS>, should existing shareholders not fully subscribe to the firm's 1.27 trillion won rights issue.

Lee, vice chairman of Samsung Group flagship affiliate Samsung Electronics Co Ltd (>> Samsung Electronics Co Ltd), currently owns 11.25 percent of Samsung SDS. Neither Samsung SDS nor Samsung Engineering are considered critical components of the family-run conglomerate's ownership structure.

(Reporting by Se Young Lee; Editing by Clarence Fernandez)