BEIJING, Oct 26 (Reuters) - China’s state planner and foreign exchange regulator met with companies in key sectors on Tuesday over their foreign debt holdings, the National Development and Reform Commission (NDRC) said amid ongoing investor concerns over the debt of property developers including China Evergrande Group. The regulators asked the unnamed companies to optimise their foreign debt structures and proactively prepare for repayment of both principal and interest on their foreign bonds, the NDRC said in a statement on its website. Reporting by Beijing Newsroom Editing by David Goodman