Eagles wide receiver A.J. Brown ignited a public kerfuffle Sunday when he was spotted reading a book — Inner Excellence: Train Your Mind for Extraordinary Performance and the Best Possible Life, by Jim Murphy — to inspire himself during the team’s wild-card victory over the Green Bay Packers.

Eagles coach Nick Sirianni was the latest to weigh in on Brown’s reading habits during Tuesday’s appearance on Philly sports radio’s WIP Morning Show and said that he was completely “O.K.” with the Pro Bowl wideout’s behavior. Sirianni gave his full support to Brown for doing what he needed to do to mentally prepare for the game.

The Philadelphia Eagles wide receiver was spotted reading Jim Murphy’s “Inner Excellence: Train Your Mind for Extraordinary Performance and the Best Possible Life” on the sidelines during Sunday’s playoff game against the Green Bay Packers. The book soon took the top spot on the Amazon trending list.