* Moderna to supply more than 20 million doses of vaccine

* Two Chinese firms allowed to hold Phase 3 clinical trials

* Duterte to be privately inoculated with Sinovac vaccine

MANILA, Jan 19 (Reuters) - The Philippines will buy 20 million doses of Moderna's COVID-19 vaccine, presidential spokesman Harry Roque said on Tuesday, adding to deals for a total of 72 million doses from AstraZeneca, Novavax and Sinovac.

With more than 504,000 COVID-19 cases and nearly 10,000 deaths, as of Tuesday, the Philippines has the second highest level of infections in Southeast Asia.

President Rodrigo Duterte has said he preferred that the Philippines sources its COVID-19 vaccines from either China or Russia and on Tuesday Food and Drug Administration chief Rolando Enrique Domingo told state-owned PTV network that late-stage clinical trial applications from Sinovac and Clover Biopharmaceuticals have been approved.

Duterte wants to take the Sinovac vaccine as soon as it is available, but without media coverage of the vaccination, Roque told a regular news conference. (Reporting by Neil Jerome Morales; Editing by Ed Davies and Alexander Smith)