GENEVA, June 9.-A special representative of Secretary General Thant of the United Nations today requested the cooperation of the Food and Agriculture Organization and the League of Red Cross Societies in a largescale food relief program for East Pakistan.

According to reliable sources, the two agencies, together with the United Nations Children's Fund and donations from governments, are expected to provide the bulk of the grain and edible oils needed.

The United Nations official, Ismat Kattani, an Assistant Secretary General, stopped off in Geneva today on his way back to New, York after conferences in Dacca, the capital of East Pakistan. He plans further talks with the officials of UNICEF after he reports to Mr. Thant tomorrow.

Reliable sources said Mr. Kattani felt that he had obtained the consent of the Pakistani Government, which had previously been unwilling to accept outside help, for aid under the "United Nations umbrella."