Rapoport adds that Michigan showed initial interest in John's brother, Jim Harbaugh, head coach of the San Francisco 49ers, but John is now viewed as more of a long-term option.
At 2-3, the Wolverines are off to one of the worst starts in school history, losing three games in September for the first time ever. Their most recent loss was a 30-14 drubbing at the hands of Minnesota.
In seven seasons with the Ravens, Harbaugh has a regular season record of 64-35. He led Baltimore to a win in Super Bowl XLVII.
-- Alex Suskind