The Denmark football federation fined the Brondby fans who threw dead rats saying the act was "an aggravating circumstance."
Dead rodents were hurled at Ludwig Augustinsson as he took a corner during the closing moments of the Superliga derby.
Henan Jianye did not release details of the deal, but reports in Denmark said the 21-year-old had joined for €6 million.
Former Columbus Crew SC goalkeeper Steve Clark has signed a six-month contract with Danish club AC Horsens.
Thomas Delaney says he has no regrets about moving to Werder Bremen having played the "best six months" of his career for FC Copenhagen.
Talks are taking place over an international league involving the biggest clubs in Scandinavia, Scotland, the Netherlands and Belgium.