(Reuters) - U.S. food companies Kraft Heinz Co (KHC.O) and Mondelez International Inc (MDLZ.O) have been short-listed to participate in the second round of Campbell Soup Co?s (CPB.N) auction of its international business, people familiar with the matter said. Tins of Campbell's Tomato Soup are seen on a supermarket shelf in Seattle, Washington, U.S. February 10, 2017. REUTERS/Chris Helgren/File Photo The development boosts Campbell Soup?s chances of divesting its international portfolio, which includes its Australian cookie brand Arnott?s and Danish baked snacks maker Kelsen Group, with one deal, two sources said on Sunday.