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 ObamaJames Comey and his cronies have damaged the FBI — how can we fix it? When immigration judges get political, justice suffers Trump denies clemency to 180 people 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 JohnsonCongress obtains recovered text messages from FBI agents Experimental drugs bill runs aground despite Trump, Pence support GOP moves to cut debate time for Trump nominees MORE (R) threw his support behind the former Massachusetts governor.

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