The 6-1, 250 sophomore is expected to enroll in classes at Auburn this week and go on scholarship. He is expected to file a hardship appeal with the NCAA asking for relief from the one-year automatic redshirt rule for players transferring from one Division I college to another.
He played two seasons at Illinois and has not been redshirted so he will have three years to play two years at Auburn.
Prosch was named a first-team All-American by Pro Football Weekly on Dec. 12 and was an Academic All-Big Ten honoree this year.
"Jay Prosch has decided to transfer to Auburn and will be there for the current semester," Beckman said on Wednesday. "He will have an opportunity to be much closer to his mother, who continues to face health issues. We wish Jay the best as he makes this move."
Prosch is shown as a high school senior.
A standout linebacker at UMS-Wright in Mobile and the 4A Lineman of the Year in 2009, Prosch served primarily as a blocking back the past two seasons for the Fighting Illini, registering two carries for nine yards in his career.
He also was a diligent special teams player, sharing the team's outstanding special teams player award for 2011. Prosch led the squad with 10 tackles this season and had 11 total tackles for the year.
In 2010, he helped pave the way for Illinois' single-season rushing leader, Mikel Leshoure, and the Big Ten's top rushing offense.
One of the strongest players in Alabama his senior year, Prosch was a dominant defender for Coach Terry Curtis at UMS-Wright. Helping his team to a playoff, berth he recorded 199 total tackles, 114 solo stops, 16 for loss, five pass breakups and a sack. Prosch earned first-team All-State honors as an offensive lineman his junior year as he helped the Bulldogs to the 4A State Title.
He finished his high school career playing in the Alabama-Mississippi All-Star Game.