The Denver Broncos have contacted Michigan head coach Jim Harbaugh about their coaching vacancy, a source told Mike Florio of Pro Football Talk.

The Broncos fired first-year head coach Nathaniel Hackett on Monday amid a disastrous rookie campaign in which the team expected to be a playoff contender.

Meanwhile, the Wolverines fell short in the College Football Playoff semis for the second straight season on Saturday, suffering an upset loss to TCU.

In early December, Harbaugh vowed to return to Michigan next season after it was reported NFL teams were exploring him as a head coaching candidate.

The 59-year-old interviewed with the Minnesota Vikings last offseason, but after opting to go back to the Wolverines, he said he was closing the door on an NFL return.

Denver’s new ownership group reportedly intends to be “ultra-aggressive” in securing the team’s next head coach.

Harbaugh coached the San Francisco 49ers from 2011-14, earning a 44-19-1 regular-season record and one Super Bowl appearance in three postseason berths.

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