"Our Team had COVID-19 tests right upon arrival in Sanya, and the results were all negative," Team China said in a social media post.
"We had coronavirus tests again on Sunday before the end of the 14-day quarantine, which showed the same results.
"All the players will return back to their clubs," it added.
China postponed all domestic games in January and banned the entry of foreigners in the country last month in a blow to hopes that a start to the new Chinese Super League (CSL) season was on the horizon.
Several CSL teams, without their foreign recruits, have begun pre-season training behind closed doors, Xinhua reported.
CSL's new season was originally scheduled to kick off on Feb. 22. (Reporting by Amlan Chakraborty in New Delhi; editing by Christian Radnedge)