"In connection with the confirmation of the positive test result of French President Emmanuel Macron, whom he met yesterday at the Elysee Palace, the Prime Minister went into self-isolation," - quoted by the press service of Costa TASS.
The Portuguese prime minister also canceled his official visits, which had been scheduled for December 18-20.
His press service clarified that Costa does not have any symptoms of coronavirus.
On December 17, Macron tested positive for coronavirus infection.
Spanish Prime Minister Pedro Sanchez, who met with him three days ago, also went into self-isolation until December 24.