During the 30 minute meeting, Parrikar and Singh are believed to have discussed about the stand-off between Indian and Chinese forces in Ladakh and various other issues concerning the country, sources said.
Both Singh and Parrikar are part of the country's highest decision making body on security issues, the Cabinet Committee on Security, headed by Prime Minister Narendra Modi.
Singh, who was supposed to visit Indo-China and Indo-Pak borders, has postponed the trip due to a key meeting of BJP on Bihar.