Kabeer Gbaja-Biamila, a former Green Bay Packer, endorsed GOP contender Rick Santorum Sunday.

“I am endorsing Rick Santorum for president because he is a solid leader that represents the timeless values that made America good and prosperous,” the former defensive end said in a statement.

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"Rick Santorum is also the only person who can beat Barack ObamaBarack Hussein ObamaAll five living former presidents to attend hurricane relief concert Overnight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Interior moves to delay Obama’s methane leak rule MORE in November. While some may want to declare the game over, the reality is, it's not even halftime yet. 'Game on!' "

Gbaja-Biamila was drafted to the Packers in 2000 and left the team after nine years. He holds the Packers’ sacks record with 74 and a half.

The defensive end has unofficially retired from football.

"Football taught me a lot," Gbaja-Biamila said. "One of the game's greatest lessons is that we play to win, and we play until it is over. 

Wisconsin’s Tuesday primary is a critical contest for Santorum, who is trailing GOP front-runner Mitt Romney in national polls and in delegates. 

Romney has been boosted this week by a series of high-profile endorsements as party leaders seek to coalesce around the presumptive nominee and end a protracted nomination fight. On Sunday, Wisconsin Sen. Ron JohnsonRonald (Ron) Harold JohnsonGun proposal picks up GOP support GOP lawmaker to unveil bill banning gun bump stocks Senate Homeland Security chairman backs bump-stock ban after Las Vegas shootings MORE (R) threw his support behind the former Massachusetts governor.

A poll last week found Santorum trailing Romney by seven points in Wisconsin.