A visitor wearing a face mask attends the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

Visitors wearing face masks attend the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

Visitors wearing face masks attend the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

A visitor wearing a face mask poses as he attends the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

Visitors wearing face masks attend the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

Visitors wearing face masks attend the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

A visitor wearing a face mask attends the "Meet Vicent Van Gogh" exhibition, as the spread of the coronavirus disease (COVID-19) continues, in Lisbon, Portugal, May 29, 2020. REUTERS/Rafael Marchante

European Commission vice-president in charge of European Green Deal, Frans Timmermans (C), and EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira (R) and EU Commissioner for Jobs and Social Rights (unseen), address a joint press conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira, attends a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

European Commission vice-president in charge of European Green Deal, Frans Timmermans, EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira and EU Commissioner for Jobs and Social Rights Nicolas Schmit address a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

European Commission vice-president in charge of European Green Deal, Frans Timmermans, EU commissioner-designate for Cohesion and Reforms, Portugal's Elisa Ferreira and EU Commissioner for Jobs and Social Rights Nicolas Schmit address a news conference on Green and Just Recovery at the European Commission headquarters in Brussels, Belgium May 28, 2020. Aris Oikonomou/Pool via REUTERS

Shop assistants wait for costumers at a canned fish shop, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal May 25, 2020. REUTERS/Rafael Marchante

Shop assistants wait for costumers at a canned fish shop, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal May 25, 2020. REUTERS/Rafael Marchante

A waiter waits for customers at a restaurant, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal May 25, 2020. REUTERS/Rafael Marchante

A shop assistant waits for costumers at a canned fish shop, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal May 25, 2020. REUTERS/Rafael Marchante

Social distancing markings are seen on the sidewalk at Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

People are seen at Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

A woman lies on the ground at Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

A discarded face mask lies on Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

People walk on Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

People walk on Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

People walk their dogs on Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

People practise on surfboards at Carcavelos beach, amid the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 23, 2020. REUTERS/Rafael Marchante

People enjoy sunny weather minding social distancing markers arranged by municipal workers at Marechal Carmona park following the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 21, 2020. Picture taken May 21, 2020. REUTERS/Rafael Marchante

People enjoy sunny weather minding social distancing markers arranged by municipal workers at Marechal Carmona park following the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 21, 2020. Picture taken May 21, 2020. REUTERS/Rafael Marchante

Municipal workers arrange social distancing markers at Marechal Carmona park following the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 21, 2020. Picture taken May 21, 2020. REUTERS/Rafael Marchante

Cascais ressident Marina Lima has blood drawn to test for coronavirus antibodies following the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 21, 2020. Picture taken May 21, 2020. REUTERS/Rafael Marchante

Cascais ressident Marina Lima waits to give blood to test for antibodies following the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 21, 2020. Picture taken May 21, 2020. REUTERS/Rafael Marchante

Cascais ressident Marina Lima has blood drawn to test for coronavirus antibodies following the coronavirus disease (COVID-19) outbreak, in Cascais, Portugal May 21, 2020. Picture taken May 21, 2020. REUTERS/Rafael Marchante

Staff wearing protective masks and face shields serve customers from behind screens at custard tart shop Pasteis de Belem, as restaurants, museums and coffee shops reopen at reduced capacity, during the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal May 18, 2020. REUTERS/Rafael Marchante

Women wearing protective masks work at custard tart shop Pasteis de Belem, as restaurants, museums and coffee shops reopen at reduced capacity, during the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal May 18, 2020. REUTERS/Rafael Marchante

Students wearing protective face masks sit in a classroom at D. Pedro V High School, as grade 11 and 12 high school students return to schools under strict restrictions, during the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal May 18, 2020. REUTERS/Rafael Marchante

Students wearing protective face masks sit in a classroom at D. Pedro V High School, as grade 11 and 12 high school students return to schools under strict restrictions, during the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal May 18, 2020. REUTERS/Rafael Marchante

A student wearing a protective face mask uses hand sanitizer upon arrival at D. Pedro V High School, as grade 11 and 12 high school students return to schools under strict restrictions, during the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal May 18, 2020. REUTERS/Rafael Marchante

A woman wearing a protective mask walks, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal, May 14, 2020. REUTERS/Rafael Marchante

Two people talk at the entrance of a shop next to a mannequin with a protective mask and a face shield, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal, May 14, 2020. REUTERS/Rafael Marchante

The workers of a restaurant prepare for its opening next Monday, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal, May 14, 2020. REUTERS/Rafael Marchante

A man cleans the window of a shop, amid the coronavirus disease (COVID-19) outbreak, in downtown Lisbon, Portugal, May 14, 2020. REUTERS/Rafael Marchante

A worker cleans a giant glass box before the visit of relatives at an elderly residence as the spread of the coronavirus disease (COVID-19) continues, in Montijo, Portugal May 12, 2020. Picture taken May 12, 2020. REUTERS/Rafael Marchante

Rosa Gordo speaks with her niece Fatima Sousa through a glass window to prevent infection at an elderly residence as the spread of the coronavirus disease (COVID-19) continues, in Montijo, Portugal May 12, 2020. Picture taken May 12, 2020. REUTERS/Rafael Marchante

Maria das Merces speaks with her father Adriano Borges through a glass window to prevent infection at an elderly residence as the spread of the coronavirus disease (COVID-19) continues, in Montijo, Portugal May 12, 2020. Picture taken May 12, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa and Economy Minister Pedro Siza Vieira wear protective masks during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal’s Prime Minister Antonio Costa manipulates his protective mask during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa gestures as he wears a protective mask during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal’s Prime Minister Antonio Costa gestures as he speaks during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa wears a protective mask as he attends a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa gestures as he speaks during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa gestures as he speaks next to Economy Minister Pedro Siza Vieira, who is wearing a protective mask, during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa speaks during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa adjusts his protective mask as he attends a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal?s Prime Minister Antonio Costa gestures as he speaks during a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

Portugal’s Prime Minister Antonio Costa wears a protective mask as he attends a biweekly debate at the parliament, amid the coronavirus disease (COVID-19) outbreak, in Lisbon, Portugal, May 7, 2020. REUTERS/Rafael Marchante

A woman arranges a shop window before its reopening, as the country eases the lockdown due to the spread of the coronavirus disease (COVID-19), in downtown Lisbon, Portugal May 4, 2020. REUTERS/Rafael Marchante