NEW YORK — Mayor Bill de Blasio announced that he is delaying the opening of mass vaccination sites at Yankee Stadium, Citi Field and Empire Outlets until the city receives more vaccine supply. 

It comes after the city canceled 23,000 first-dose vaccination appointments last week and temporarily shuttered its 15 community vaccination hubs.

“We have a supply problem and we have a flexibility problem because we can’t access second doses that are being held in reserve for weeks ahead and use them now as first doses where there’s such intense demand,” said Mayor Bill de Blasio at his daily press briefing.

The Citi Field site was scheduled to open Monday. The Empire Outlets site was expected to open last week. 

The city currently has 19,000 first doses in its reserves and expects to receive 107,825 this week.

“That doesn't even give us the beginning of what we need for a week,” he said.

It has more than 212,000 second doses on hand. The mayor has asked the federal government for flexibility to use that second dose supply to give people their first doses. 

As of Sunday, de Blasio said the city has vaccinated 628,831 people so far.

“That is more people who have gotten the vaccination in New York City than the entire population of Louisville, Kentucky, which is the nation’s 29th largest city,” he said at his press briefing Monday.

Second doses are also still on track to be administered, he said.

He also emphasized that the city has the capacity to vaccinate half a million New Yorkers a week as long as it has an adequate supply and more flexibility in administering the doses. 

“Even though we don't have the supply of vaccines we need—we urgently need more supply, we urgently need more flexibility with the supply we have—the vaccination effort keeps moving forward,” the mayor said.

The shortage means the city likely won't meet its goal of vaccinating one million people by the end of January. 

"We were absolutely confident we could hit that number," said Mayor de Blasio. "This was absolute fact that unfortunately ran into the buzz saw of lack of supply and lack of flexibility." 

Meanwhile, Gov. Andrew Cuomo said Monday the state is prepared to administer up to a million coronavirus vaccines each day, but that it’s currently impossible with the amount of doses provided by the federal government.

“We are ready for distribution of the vaccine in a much larger quantity," Cuomo said. "We have 3,000 distribution sites, 3,000 providers already signed up so we can get the needle in the arm. We just need the supply itself."

The governor warned local officials to only schedule appointments that they’re confident won’t need to be canceled.

But Cuomo acknowledged how difficult this could be given that shipment amounts vary week to week, fluctuating between 250,000 and 300,000 doses.

“Right now, we go week to week and we don’t know what we’re going to get next week. So I can’t tell every county what they're going to get next week so they don't know what to schedule,” said Cuomo.

He said that issue, and others, will be discussed on a conference call between governors and White House staff on Tuesday.

The mayor said he’s hopeful the Biden administration will ramp up vaccine production. 

“What is so clear now is the commitment of the Biden administration and the leading health experts in the administration to finding every conceivable way to get us more vaccines quickly,” said Mayor de Blasio.

The governor also announced a new hotline to report vaccine fraud. He urged New Yorkers with information to call 1-833-VAX-SCAM.