49ers lineman: "Jim Harbaugh 'demanded too much' and 'might be clinically insane.'"

Michigan football coach Jim Harbaugh might want to avoid talk of this on the recruiting trail.

Alex Boone, an offensive lineman who played under Harbaugh when he coached the San Francisco 49ers, said the hard-driving coach may be certifiably "crazy," NBC Sports' ProFootballTalk reported Sunday.

"I think he just pushed guys too far," he told HBO's "Real Sports with Bryant Gumbel" in a segment to air Tuesday, as quoted by NBC's ProFootballTalk.

"He wanted too much, demanded too much, expected too much. You know, 'We gotta go out and do this. We gotta go out and do this. We gotta go out and do this.' And you'd be like, 'This guy might be clinically insane. He's crazy,'" said Boone, who does not hold a degree in psychology.

MORE: http://www.huffingtonpost.com/2015/04/20/jim-harbaugh-alex-boone_n_7100556.html

Clinically insane? I'll let the doctors diagnose that one. But it's easier to understand how Harbaugh's relationships with the team and front office disintegrated over time. Even Harbaugh admits as much: "it must be true, yeah, sometimes I wear out my welcome," he told ProFootballTalk.

Too bad. The guy is a great coach.

Good luck, Michigan.