Mayor Bill de Blasio expressed confidence Friday that the USNS Comfort hospital ship, docked in New York Harbor and so far treating just 20 patients, will soon see a surge in admissions.

“I’ve talked to our colleagues in the Navy, I don’t have a question in my mind that number’s going to change very rapidly,” de Blasio said on MSNBC’s “Morning Joe.”

“I’m sure that ship will be very full soon. They have to be smart about what cases they take and create a protocol that’s going to work because it’s going to get very busy, very quickly next week,” he continued.  “So I’m convinced over the next few days they’ll be prepared.”

The 1,000-bed vessel docked on the West Side’s Pier 90 Monday. The floating hospital is reserved for non-coronavirus patients to free up beds in overwhelmed hospitals for those who need them most.

But by Thursday morning, only three of the 1,000 beds had patients. Later that night, the number increased to 20. A Navy spokesman said he expects a significant increase in admissions, but said each patient had to be referred to the ship by a local hospital first.

Bureaucratic roadblocks and military requirements have prevented the Comfort from filling its beds, according to the New York Times.

One of the hurdles is that the Navy won’t treat people with a series of other ailments besides COVID-19, the outlet reported.

But de Blasio reiterated his assurances that the situation would soon change in a second TV appearance Friday on CNN’s “New Day.”

“There’s no question in my mind that’s going to get resolved very quickly and you’re going to see that number grow,” de Blasio said.

The mayor said he’s more concerned about a “staggering” number of ICU patients flooding traditional city hospitals early next week.