Tom Brady makes the New England Patriots’ offensive coordinator job look easy. But looks can be deceiving. In fact, the last two New England Patriots offensive coordinators agree: Brady makes their job incredibly challenging.

Patriots offensive coordinator and current Texans coach Bill O’Brien explained why that is.

“Josh McDaniels is one of my closest friends, and we talk about this all the time,” O’Brien told CBS Houston in June. “One of the most difficult jobs you can have is coaching Tom because he wants to be coached, you coach him every single day, every minute of the day and all year round because he’s all football. He’s a phenomenal guy and the reason why he is what he is, is because he’s obsessed with football. He’s a great family guy, don’t get me wrong, but he’s obsessed with football and so when you’re coaching him you better be ready to go at a moment’s notice whether it’s for a meeting, or practice or game and it made me a much better coach when I was fortunate enough to coach him.”

Brady and O’Brien had a strong relationship throughout their tenure together, despite getting into a screaming argument on the sideline during a win over the Washington Redskins in 2011. The moment was a display of just how much Brady and O’Brien care about football.

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Brady’s dedication to his job borders upon obsession. He told Patriots Wire he spends 16 hours per day on football during the season. All that preparation can be daunting for a coach who is supposed to be teaching Brady something he doesn’t know.

“He sets the bar really high,” Patriots assistant quarterbacks coach Jerry Schuplinski told Patriots Wire in February. “If you’re going to have a meeting with him or present something to him, you’re going to have to be prepared because he’s going to have a lot of questions for you, and it’s because he’s done his homework already, and he’s seen a lot of the film.”

When O’Brien first left the Patriots to join Penn State as the head coach, he was in for a rude awakening. He quickly realized the difficulties of not having Brady.

“When I went to Penn State after having coached Tom [Brady] for a few years that was my first eye opener,” O’Brien told CBS Houston. “We went out for out first spring practice at Penn State and I was like, alright we’re going to do these 100 plays today and I think we were like 1 for 30. Now, there was a high wind that day in Happy Valley so I blame it on the wind, but guys didn’t know where to line up and it was like, what am I doing? So we simplified it and began being decent offensively that first year, but that was my first experience of knowing it’s different.”

[H/T WEEI.com]