He did not elaborate on the type of help sought, and the US embassy did not immediately comment.
Diesel fuel and thick oil from the tanker have contaminated the waters and beaches of nine municipalities along the coast of Oriental Mindoro province, known for its rich marine life.
More than 2,500 hectares of coral reefs, mangroves and seaweed could be affected by the spill, the environment ministry said previously.
It is not known how much diesel and oil have leaked into the water.
The Philippine Coast Guard said on Friday it had found oil as far away as Casian Island, off the north coast of the western island of Palawan.
That is about 350km southwest of where the tanker sank.
Dozens of people have fallen ill in Oriental Mindoro after oil washed up on their shores, the provincial government said earlier this week.
Residents and coast guard personnel have been removing oil-coated seaweed and other debris from affected beaches.
An oil spill boom was deployed on Wednesday after rough seas hampered earlier efforts to contain the slick
Thousands of fishermen have been ordered to stay on shore until they can fish safely, and swimming is also banned.