MIAMI (CBS4) – Former Miami Dolphins star Mark Duper announced Monday that he is battling cancer.

The wide receiver recently underwent surgery to remove a cancerous tumor in his right kidney at Jackson Memorial Hospital.

Duper discovered something was terribly wrong during the Dolphins Cycling Challenge, which honored former teammate Jim Mandich, who succumbed to bile duct cancer, and raised money for the University of Miami’s Sylvester Comprehensive Cancer Center.

While riding, Duper began feeling discomfort and a shortness of breath. After undergoing an ultrasound, a malignant mass was discovered on his right kidney.

Duper underwent surgery, where doctors removed the affected kidney before is spread to other organs.

Doctors say there is a 95% chance that all the cancer has been removed.

Duper is now recovering at home.