Former NYPD Commissioner James O'Neill has been appointed as the city’s senior coronavirus advisor, Mayor Bill de Blasio announced Wednesday.

O'Neill, who retired as the city’s top cop late last year and has been working as head of security for Visa, will return to the city to help the administration's response to the ongoing health crisis.

"It's important that we all come together as New Yorkers," O'Neill said Wednesday during a press briefing alongside de Blasio. "I felt compelled to come back and do whatever I could do."

O'Neill will be tasked with monitoring the city’s medical supply line to public hospitals, ensuring that all facilities are receiving the life-saving materials they're in need of.

O'Neill will build a team that includes other administration officials, and ensures there is a presence at the hospitals to monitor the supply chain and ensures personnel is flowing to the hospitals that need them most.

O'Neill, who has no health care background, will be doing the work on a voluntary basis, officials said. ​