LJUBLJANA, June 5 (Reuters) - Slovenia's largest fuel retailer Petrol PETG.LJ will next week hold meetings with investors ahead of a possible international bond issue, the company said in a statement on Thursday. It said it had mandated JP Morgan to arrange a series of meetings across Europe from June 9. "Depending on market conditions, the meetings may be followed by an inaugural issue of euro-denominated bonds," the company said, without giving further details. It also said it had obtained a preliminary Standard&Poor's credit rating, with a long-term rating of BBB- and a short-term rating of A-3 with a stable outlook. (Reporting By Marja Novak; Editing by Zoran Radosavljevic and Mark Potter) ((Marja.Novak@thomsonreuters.com)(+386-8-205-6369)(Reuters Messaging: marja.novak.thomsonreuters.com@reuters.net)) Keywords: SLOVENIA PETROL SLO ENERG/