The Shanghai Diamond League and a second meeting in China in August will not take place due to the strict travel restrictions and quarantine rules in place for entry into the country amid the COVID-19 pandemic, the league said on Thursday.

"Due to the combination of travel restrictions and strict quarantine requirements in place for entry into China, as well as the Olympic Games and other Diamond League meetings, these events are not able to be rescheduled into a busy summer program," the league said in a statement.

Organizers of the two events, which were scheduled to take place on August 14 and 22 respectively, are exploring if they can stage exhibition meets after the series finishes with the Diamond League Final in Zurich on September 8-9.

The 2021 calendar is subject to further changes depending on the global health situation, added the statement.

The Shanghai Diamond League was among a number of meetings cancelled last year.

"In order to ensure a structured and fair qualification for the final, some disciplines which were scheduled to be held at the Chinese events will now be reallocated to other meetings," the league said.