But every head coach has different expectations of their players, particularly on what they should be doing on the sidelines. Yet, don’t expect Eagles coach Nick Sirianni to stop Brown from reading that book. In fact, he’s known about it for a long time now.

"Better than Andy Reid. Better than Dick Vermeil. This is the fourth consecutive season he has led this team to the playoffs. He's the only coach in Eagles history to do that his first four seasons. He was a play away from beating Andy Reid and Patrick Mahomes in a Super Bowl."

Some in the media have criticized Brown’s reading, believing he was frustrated or disgruntled. On Tuesday, Eagles head coach Nick Sirianni responded to those critics and criticized “lazy” journalism or people who give an opinion on a topic without proper research.