San Francisco guard Alex Boone, who used to work with coach Jim Harbaugh during his time with the 49ers, said that the latter "wore out his welcome" to the team.

The 49ers closed their doors on Harbaugh after last season, which prompted him to go to the University of Michigan, according to Yahoo Sports.

Now, Boone has finally explained the decision of the team in detail on HBO's "Real Sports." 

"He does a great job of giving you that spark, that initial boom. But after a while, you just want to kick his a--. ... He just keeps pushing you, and you're like, 'Dude, we got over the mountain. Stop. Let go.' He kind of wore out his welcome," Boone said, according to ProFootballTalk which transcribed parts of the interview.

Asked what his statement meant, Boone explained that their former coach pushed the players of the team "too far."

"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.' ... I think that if you're stuck in your ways enough, eventually people are just going to say, 'Listen, we just can't work with this,'" he added.

The Sacramento Bee said this latest revelation from Boone is entirely different from what he said during the season.

"He's a great guy, a great coach. How could you not want to win for a guy that wears cleats during a game? Have you not seen that guy's energy? He's exciting 24/7. You've got to love playing for a guy like that. That's what's football is all about," he earlier said in a radio interview quoted by The Sacramento Bee.

The same report added that these comments from the San Francisco guard reveal that Harbaugh can "grind away on people." "It also shows that 49ers executives weren't the only ones suffering from Harbaugh fatigue," the outlet added.

Detroit News explained that Harbaugh left the 49ers after last season when the team was out of the playoffs for the first time in four seasons.

It added that when the coach was asked about his exit from the team, he said, "You work at the pleasure of an ownership group. And they felt it wasn't in their best interest."

Meanwhile, Boone reportedly started all the games of the season except the first and final games as right guard.

"He missed the opener after skipping offseason workouts and training camp while holding out for a new, two-year contract. A knee injury sidelined him for Harbaugh's finale, a 20-17 win over the Arizona Cardinals," Detroit News wrote, adding that his absence from the final game made him "see enough" to change his opinion of the coach.