Kevin Wang of ESPN.com reported the news Sunday, noting Mayo landed in Shenyang on Friday and is now in the mandated 14-day coronavirus quarantine period before he can go through the medical clearance process and complete paperwork to join the league.
Wang explained the Flying Leopards were in search of a third import player because of potential eligibility concerns with Lance Stephenson and Brandon Bass.
Both former NBA players have been in the United States during the coronavirus pandemic, and China has temporarily banned entry from foreign travelers in an effort to control the spread. Mayo provides something of an insurance policy should Stephenson and Bass have difficulty rejoining the team when the season, which has been on hiatus since late January, restarts.
Mayo arrived at USC as a highly regarded recruit and was named to the All-Pac-12 first team during his one collegiate season.
His future looked bright early in his NBA career, especially after he averaged a career-best 18.5 points per game during his rookie season on the Memphis Grizzlies. He was solid again in his second season at 17.5 points per game but gradually saw his numbers dip.
Mayo also played for the Dallas Mavericks and Milwaukee Bucks during an eight-season NBA career but was eventually dismissed from the league in 2016 after he violated its substance-abuse policy.
He averaged 13.8 points, 3.1 rebounds and 2.9 assists a night in the NBA.
Wang noted the USC product has experience playing in China from when he suited up for Hunan last year in the NBL, which is the country's second-tier league.