Bill Belichick's failure to land another coaching role in the NFL after leaving the New England Patriots was unsurprising due to the level of control he demands, says his former tackle Mike Pennel.

Belichick is regarded as one of the greatest head coaches in NFL history, leading the Patriots to nine Super Bowls and winning six during 23 seasons in charge between 2000 and 2023.

His six Super Bowl titles as a head coach match the best returns of any franchise in NFL history, with the Patriots and the Pittsburgh Steelers both possessing six.

He is also within reach of Don Shula's record for the most victories as an NFL head coach, with his total of 333 (including postseason games) putting him 14 behind the Miami Dolphins legend (347).

If only regular-season games are counted, Belichick has 302 victories to Shula's 328.

However, Belichick parted company with the Patriots after they went 4-13 during a dismal 2023 season, and he was unable to land a new role despite being linked with several teams, including the Los Angeles Chargers and Dallas Cowboys.

Pennel, who spent six months with Belichick's Patriots in 2019, believes the level of control he demands over a franchise's direction proved off-putting. 

"Bill Belichick's one of the greatest coaches of all time, if not that. So it's going to look a lot different. He was coaching in the NFL before I was even alive," he told Stats Perform.

"I'm clearly just speculating because I'm not part of the New England Patriots franchise, but I just think the situation was, it was that time where they wanted to change.

"They wanted a fresh face and Bill wants things to run a certain way and I don't think franchises are willing to relinquish that much control to a new coach. 

"I just think he wants to take his time. I know he's a family man and just wants to enjoy the time with his family. He's already done everything."

Jerod Mayo has taken the reins in Foxborough following Belichick's departure, with quarterback Drake Maye being drafted third overall to lead the team into a new era.

Pennel, however, believes teething problems will be part of the process this year, saying: "It's hard. It takes some time. You know, there's a couple years of transition depending on how much time you have with the players and everything like that. 

"You're learning a whole new system. You're learning with all new players, you're learning with all new staff, so it's very hard. 

"I don't think it's ever happened like that, in the first year to go to a Super Bowl. It's hard to get to that successful level."