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Kevin Hoffman, Kevin Hoffman-USA TODAY Sports

Buffalo Bills co-owner Kim Pegula has been undergoing medical treatment for "unexpected health issues." The Bills released a statement Tuesday on Pegula's progression as she is making a recovery. 

"Kim is progressing well and is resting and rehabilitating from a health issue. We are grateful for the medical professionals providing our case and to everyone their prayers and well wishes. We ask that you please continue to respect our need for privacy during this time." 

Pegula, 53, purchased the franchise alongside her husband, Terry, in 2014 and has played a direct role in the Bills' ongoing plans to construct a new stadium. The Pegula family initially announced that Pegula was receiving treatment June 14.

"Kim Pegula is receiving medical care as a result of some unexpected health issues," the Pegula family said in a statement, via ESPN. "We are very grateful for the progress (Kim) has made over the past few days. She has an exceptional team of medical experts at her side. We ask that you keep Kim and our family in your prayers and ask that you respect our need for privacy."

Bills officials declined to elaborate on the initial statement, per the Buffalo News, which does not detail the severity of Pegula's health issues, or where she is receiving treatment. Shortly after, the team issued the following message on social media: "All of Bills Mafia is sending our love and prayers to you, Kim. We are with you and the entire Pegula family."

Pegula is also the president of Pegula Sports & Entertainment, she and Terry's company that oversees not only the Bills but the NHL's Buffalo Sabres, the National Lacrosse League's Buffalo Bandits and Rochester Nighthawks, and the American Hockey League's Rochester Americans. Her husband, Terry, was last estimated by Forbes to have a net worth of just under $6 billion.

Pegula has most recently headlined efforts by the Bills to finalize plans for a new $1.4 billion stadium in Orchard Park, New York, with the state recently approving a $600 million contribution to bring the project to fruition.