The New York State Public Employment Relations Board has appointed a mediator to help the city's police union and the de Blasio administration settle their negotiations.
The union filed for an impasse action with the board, saying conversations between the union and the city were "fruitless."
The union has been without a contract since 2010.
They say the city does not want to provide raises for the first three years of a deal.
The Patrolmen's Benevolent Association originally filed for an impasse in February but was denied.
PBA president Patrick Lynch said the teachers' union deal has little bearing on their talks.
"The teachers will negotiate for the teachers. We'll negotiate for the police officers," Lynch said. "What's been offered for New York City police officers doesn't resolve the problem and is unacceptable. Any time there's zeroes in a proposal, it's unacceptable."
Three of the PBA’s last four contracts were decided by the Public Employment Relations Board.