The football world stood behind Giants co-owner John Mara after he revealed his cancer diagnosis on Monday. 

Mara revealed in a statement that he has “recently been diagnosed with cancer.” He expressed his determination by saying, “I’m feeling strong and optimistic, and I am committed to achieving a positive outcome.”

The news led to an outpouring of support for Mara, including from several former members of the Giants organization. 

Former Giants coach and two-time Super Bowl champion, Tom Coughlin, shared his support by saying, “Sending strength, support, and prayers to John Mara. Your leadership and determination inspire everyone around you. No one battles cancer alone. We’re always proud to be on your team.”

Former Giants defensive end Osi Umenyiora recalled Mara’s kindness when he suffered a knee injury that knocked him out for the 2008 season. 

In a post on X, someone recalled, “Only one person from the Organization visited me at the hospital—John Mara. I was so surprised it was him that I just started crying. He stayed quietly by my side until I fell asleep. He will definitely overcome this.”

Former NFL wide receiver Antonio Brown wrote in a post on X that he was “hoping for the best for John Mara.” 

The Jets said that their “thoughts are with John Mara and his family” and that the organization was “Sending strength, support and well wishes.”

A number of other NFL teams sent similar messages, including the Broncos, Texans and 49ers.

It was not announced what type of cancer Mara has or what stage it was. 

Mara had been on hand at MetLife Stadium on Sunday when the Giants beat the Chargers for their first win of the season, snapping a three-game losing streak to start the season.