"We have yet to receive the impact of the strongest, most damaging wave, which will test our material and moral capacities to the limit, as well as our spirit as a society", he added.
The number of registered cases in the country rose to 24,926 on Saturday from 19,980 in the previous tally announced on Friday.
Spain on Sunday reported 394 new coronavirus-related deaths, bringing the national total to 1,720 and propelling it beyond Iran to the third in the list of most fatalities.More news: Britain's Prince Charles tests positive for coronavirus
The vast majority of people recover from the new virus.
"We are at war", Prime Minister Pedro Sanchez told a news briefing on Sunday, a day after warning that the worst was yet to come in the coronavirus outbreak.
The coronavirus pandemic has caused major devastation around the world with people in all the countries livinfg with the constant fear of getting infected with the deadly virus. The IFEMA Exhibition center in Madrid has been converted into a field hospital with 5,500 beds by the Spanish Military Emergency Response Unit.More news: You can now get free access to Thor's online training plan
The Spanish government on Friday introduced strict controls on roads leading out of the country's main cities in order to keep people inside during the coronavirus lockdown, which is part of the "state of alarm" declared six days ago.
Spain is the country that has been fourth-hardest hit by COVID-19, with 767 deaths and 17,147 infections.
The Ayre Gran Hotel Colon in Madrid has been the first to start receiving patients who have symptoms but whose condition requires medical follow-up without the need to be admitted to a hospital, both at the beginning of the disease and in the final phase.More news: Redmi Note 9S with 5000mAh Battery, 48MP Quad Camera Setup Launched