By Katie Honan

About 9,000 New York City government workers must take five-day furloughs in the coming months, Mayor Bill de Blasio said Wednesday, as part of ongoing cost-saving measures aimed at balancing a budget deficit.

Mr. de Blasio said last week that 495 mayoral staffers would have to take five-day furloughs between October and March. The additional 9,000 workers, who are in managerial and non-union-represented roles, will take furloughs during that time as well, saving the city $21 million, the Democratic mayor said at a press conference.

The announcement came as the city faces a $9 billion deficit over the next two years and as the mayor considers laying off up to 22,000 municipal workers.

"We have to keep taking actions to address this situation. None them are pleasant. None of them are things we would want to do in normal times," Mr. de Blasio said.

The new coronavirus has devastated the city's economy and forced the mayor and the city council to approve a budget at the end of June that cut some services and reduced funding to all agencies. The mayor has warned of further cuts if state lawmakers don't grant the city the authority to borrow billions of dollars, or if Congress doesn't approve a new coronavirus relief package.

"No one wants layoffs, but unfortunately they are very much still on the table if we can't find a better alternative," he said. "We have to look for any and all savings that we can find right now."

Write to Katie Honan at Katie.Honan@wsj.com