Michigan B1G Program Loses Starter To Retirement Published February 12, 2019 Wisconsin center/guard Jon Dietzen announced his retirement due to injuries from college football: pic.twitter.com/23N0axftxy — Dietzen (@DietzenJon) February 11, 2019 In this article: Recent Posts Michigan Pegged To Land Five-Star Fresh Off Decommitment Michigan Expected To Miss Out On Top Transfer Portal DB Target UM Coach Hints At Several Top Defenders Returning For Next Year, Potential Position Switch Michigan Is Hosting A Former Top Ohio State Pledge This Upcoming Weekend Michigan Offensive Starter Announces Return For Final Season