It didn't say how much it might be prepared to offer for shares of the U.K. company it doesn't already own.
``Discussions are at a very preliminary stage,'' the Tokyo- based company said today in a Regulatory News Service statement. ``There can be no assurance that an offer will be made.''
NSG, which according to Bloomberg data already owns 20 percent of St. Helens, England-based Pilkington, said it will make a further announcement in due close. Pilkington earlier said it had received a takeover approach from an unidentified party.