ESPN's Adam Schefter described the situation during an appearance Friday on 97.5 The Fanatic.
"There are a lot of things that went wrong," Schefter said. "We have the team drafting Jalen Hurts. We have Carson feeling jilted by that. We have the team trying to reassure him. We have Carson not getting past that. We have Carson struggling. We have Carson and Doug not talking for weeks on end during the season, where the head coach and quarterback are not talking for eight, nine, 10 weeks."
It's a revelation that comes after the Eagles reached an agreement Thursday to trade Wentz to the Indianapolis Colts for a 2021 third-round pick and a 2022 conditional second-round selection that could become a first-rounder based on the quarterback's playing time or the team making the playoffs.
The deal will be finalized when the NFL's new league year opens March 17.
Pederson, who guided Philadelphia to the Super Bowl LII title at the end of the 2017 season, was fired in January after the club posted a disappointing 4-11-1 record in 2020.
Wentz wasn't happy with being benched for Hurts in early December, a decision that ultimately stuck for the remainder of the regular season.
"Obviously, that's frustrating as a competitor," Wentz told reporters after he was replaced by Hurts during a Week 13 loss to the Green Bay Packers. "I wanna be the guy out there. At the end of the day, we lost. As a team, we lost and that's what I'm most frustrated about."
Based on Schefter's comments, it sounds like the silence between the 2017 Pro Bowl selection and his coach started before that decision was made, though.
Now it appears the Eagles are prepared to move forward with Hurts as their starter for 2021, though it's possible they could seek competition for him in free agency or the draft.
Meanwhile, Wentz will reunite with former Philadelphia offensive coordinator Frank Reich, who left to become the Colts' head coach in 2018.
He's set to replace Philip Rivers, the longtime Los Angeles Chargers signal-caller who joined Indy in 2020, leading the team to an 11-5 record and a playoff berth before heading into retirement.
The Colts will hope Wentz, who threw 81 touchdowns in 40 games between 2017 and 2019, returns to form after posting a career-low 72.8 passer rating in 2020.