The most affected regions are Catalonia - about 4,700 cases of the infection - and Madrid, where over 9,500 people contracted the disease.
'The worst is yet to come, ' he said, adding: 'We are at a very critical moment'.
Another four-star Madrid hotel, the Marriott Auditorium, is scheduled to start receiving patients on Friday.
The Ministry of Health has confirmed that 1,326 patients have now died from coronavirus in Spain.
Spain on Saturday reported a 32 per cent spike in new deaths from the Covid-19 coronavirus, bringing the country's total to 1,326 fatalities, the second highest in Europe after Italy.
The IFEMA conference centre would be fitted with 5,500 hospital beds, part of it dedicated to an intensive care unit, while a section of the Fira de Barcelona centre would be similarly equipped, city authorities said.
With 1,785 people being treated in intensive care units for the virus, there is mounting concern about the ability of hospitals to cope.
Spanish Prime Minister Pedro Sanchez said Sunday that his government was seeking to extend the current state of emergency, which was declared on March 14, for another 15 days after the end of the initial period.
The health authorities also revealed that among the 28,572 people infected by the virus, 3,475 are health workers.
Spain has issued lockdown orders for its roughly 46 million residents who are only permitted to leave their homes for essential work, food shopping, medical reasons or to walk the dog.
The Spanish government has chose to extend the state of emergency in the country by a further 15 days, president Pedro Sánchez confirmed this morning.
Spain is the country that has been fourth-hardest hit by COVID-19, with 767 deaths and 17,147 infections.
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Now if that isn’t the epitome of what a BFF is, I don’t know what is! Selena continues to be on chronic medication. There is also a huge list of celebrities past like famous painter vincent Van Gogh who suffered with this disease.