The International Basketball Federation says it is suspending all competitions indefinitely from Friday.
FIBA says the decision was made "in order to protect the health and safety of players, coaches, officials and fans."
The suspension includes games in the Basketball Champions League, which is a rival competition to the better known Euroleague, and the second-tier FIBA Europe Cup. The Champions League is part-way through its playoffs.
Men’s qualification for the Tokyo Olympics is expected to resume in June with a series of qualifying tournaments overseen by FIBA. Women’s qualifying has already concluded.