The teams will play at Auburn on Oct. 19, 2013.
Retiring athletics director Oval Jaynes told the JSU board of trustees at its meeting last week the game had been set. University President Bill Meehan signed the contract earlier this week, JSU sources said today.
The game had been in the works for several years and while the delay may have cast the game in doubt, Auburn athletics director Jay Jacobs told JSU officials, including Gamecocks coach Jack Crowe, he was committed to playing the game.
The game is expected to fetch JSU a guarantee of $500,000, which will go toward paying debt from a 2010 stadium expansion.
With the addition of Auburn, the Gamecocks will have played Ole Miss, Mississippi State, Florida, Kentucky and LSU of the Southeastern Conference through 2015.
They also have played Georgia Tech, Florida State, Kansas and have upcoming guarantee games with Michigan State and Central Florida.
"We knew we were going to play, it was just deciding the date," Jaynes said Friday as he was leaving his exit interview. "That was the biggest thing."
Speaking of dates, the Gamecocks also just received confirmation on a date change for the 2014 game with Central Florida. It will now be played Sept. 6, instead of the contracted date of Sept. 20.
Jaynes said the school has "a couple contracts out" that he thought would have been returned before his departure, but now he hopes they'll be in within the week.
He did not disclose the identities of those teams except to say, "it's not Alabama."
Also Friday, Meehan said Greg Seitz, JSU’s assistant athletic director for media relation will serve as acting athletic director until Jaynes’ successor is be named. Meehan said he hopes the new director would be on campus by June 1.