In a phone message, Jose Manuel Romualdez confirmed a Nikkei report citing sources on the discussions. He said there is an "intention" to hold a meeting, and the plan is "still a work in progress."

U.S. Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin are expected to meet with counterparts Enrique Manalo and Gilberto Teodoro in March, the first of such dialogue in the Philippines since the format began in 2012, Nikkei reported.

Romualdez did not respond to a question on what will be the agenda of the planned meeting, which comes at a time of simmering tensions between the Philippines and China over the South China Sea.

The Philippines is a treaty ally of the United States.

There was no immediate comment from the Philippines' defense secretary, the Philippine foreign ministry, and the U.S. embassy in Manila.

(Reporting by Karen Lema; Editing by Lisa Shumaker and Diane Craft)