Jim Harbaugh posts cryptic tweet in wake of 49ers firing of Jim Tomsula

Michigan head coach Jim Harbaugh posted an interestingly timed tweet on Sunday, an hour after the San Francisco 49ers fired head coach Jim Tomsula - Harbaugh's successor.

While it's unclear what the former 49ers coach is referring to, it could be related to his dramatic exit from San Francisco a year ago, and the rumors involving tension between he and Tomsula.

Harbaugh's message could be directed at general manager Trent Baalke, who pushed him out in favor of the one-and-done Tomsula.