He served as Minister of Justice, Agriculture, Supply and Food in the émigré government-in-exile in London.

Like Milan Rakić, who was also a diplomat, Gavrilović took leave from the Ministry of Foreign Affairs to take part in the First Balkan War as a Chetnik volunteer.

He accepted participation in the government from 27 March 1941, which gathered representatives of parliamentary political parties rooted in the people.

His status as the official Yugoslav representative in Moscow ended on 6 May 1941, when the Soviet government declared him an ordinary citizen.

His written legacy, created in the period from 1938 to 1976, was transferred in November 2013 from the Hoover Institution of Stanford University in the USA to the Archives of Yugoslavia.