Mexico on Aug. 28 said it was starting an investigation into imports of a type of aluminium foil from China, a day after U.S. President Donald Trump said he had reached a deal with Mexico on a revised North American Free Trade Agreement.

The move threatens to jolt China's exports of aluminium, which have been booming in recent months. Mexico "is a big market" for Chinese aluminium foil, one of the sources said, describing the timing of the probe as "very interesting".

Beijing is locked in a trade row with the United States, which slapped steep anti-dumping and anti-subsidy duties on Chinese aluminium foil earlier this year.

In May, Mexican firm Almexa Aluminio filed a complaint alleging aluminium foil of a thickness equal to or less than 0.08 millimetres originating in China was damaging the domestic industry, according to a statement by Mexico's Secretariat of Economy.

The product is "used as household foil, flexible packaging foil, and lithographic foil," among other applications, Texas-based consultancy Harbor Aluminum said in an Aug. 28 note. The period under investigation is the calendar year 2017, although damages will be calculated for a three-year period from 2015-17.

"We believe there are high odds for anti-dumping duties of at least 30 percent as a result of this investigation," given the duties imposed by the United States and evidence presented by the petitioner, Harbor added.

The China Nonferrous Metals Industry Association, which organised an unsuccessful joint legal defence against the U.S. duties with a group of foil makers, will also attend the meeting on Monday, one of the people said.

The people declined to be identified because they were not authorised to speak to the media.

China's Ministry of Commerce did not immediately respond to a faxed request for comment. Beijing has previously accused the United States of disregarding World Trade Organization rules with its duties on Chinese aluminium foil.

The U.S. Aluminum Association welcomed the Mexican probe.

"The North American aluminium market is highly integrated, and it is vital the region work together to combat unfair trade practices and enforce rules-based trade," association President and Chief Executive Officer Heidi Brock said in a statement on Thursday.

(Reporting by Tom Daly; Editing by Kenneth Maxwell and Christian Schmollinger)

By Tom Daly