EU officials said there was a solid consensus that remaining niggles should not hold up a final deal for Sunday, as the other 27 governments go through the new paperwork.
As per party source, while Heng Swee Keat will become first assistant secretary-general, Chan Chun Sing will be holding second assistant secretary-general post.
The USMCA would also still be subject to the full committee process, and ample debate time, which would likely push consideration of the agreement well into 2019.
Singapore's policymakers have repeatedly warned that a heated trade war between the US and China - one of the city state's major trade partners - could hurt the domestic economy.
The Chinese official said the United States had failed to back up its "unfounded" claims about China's economy that was using to disguise its own violations of the WTO rulebook.