What a difference a year makes. Twelve months ago, Jim Harbaugh was coming off a 2-4 season after which he took a sizable pay cut to remain the head coach of his alma mater. Fast forward a year and Harbaugh finally beat archrival Ohio State, led Michigan to its first Big Ten title in 17 years and won AP Coach of the Year honors.

And now, The Athletic is hearing rumblings, both from the NFL side and at Michigan, that Harbaugh might be tempted to leave the Wolverines to return to the NFL. “I think it’s real,” said one source this week when asked about the possibility of Harbaugh being interested in heading back to the NFL.

The Raiders head coaching job might be tough for him to say no to given his ties to the organization — he started his coaching career there in 2003 — and the fact that there’s already a solid quarterback in place in Derek Carr. He’s also friends with Raiders owner Mark Davis.

It is worth noting that the Raiders are on a three-game winning streak under interim head coach Rich Bisaccia and could become a playoff team if they beat the Chargers on Sunday. Whether Davis is looking to find a new head coach is yet to be determined.