Military officials would not comment on the incident on Friday.
When reached for comment, Defense Secretary Voltaire Gazmin said the military was checking out the report.
The military's Western Command (Wescom), which covers the West Philippine Sea, reportedly sent out a ship Friday afternoon to check out the report.
"If there is a need to offer assistance to help them leave the area, we will help," Gazmin said.
Wescom officials in Palawan said a ship and a plane had been dispatched to verify reports of a Chinese frigate that got stuck on Friday on a coral reef off Hasa-Hasa Shoal.
"We are still awaiting reports," Lt. Col. Neil Estrella, Wescom spokesperson, told the Inquirer.
Estrella said orders were being awaited from the national government on how to respond to the situation.