Philadelphia Eagles offensive coordinator Frank Reich says that the team's recent slide is wearing on rookie Carson Wentz.

After opening the season 3-0, the Eagles have dropped seven of their last nine games and Wentz's play has tailed off as well.

Reich said that the "most confident quarterbacks in the world lose their confidence and get battered" at times.

"Well, for a while I thought he seemed totally unflappable," Reich said. "Now, in some of the more recent losses, do you sense that this is, 'Okay, he's feeling this one, he's feeling this one?' Yeah, we're all feeling it. I think he was that young, naive -- in a good sense -- but still very mature guy who came in and it was like, 'Nothing is going to get this guy down.' But it wears on you. It wears on you. Losing wears on you in this league. That's why you've got to have the mental toughness. You've got to have the mental toughness because it's a grind, and it's especially a grind when you're not winning the games that you want to win and you lose close games. You have to have the tenacity to fight out of it and not get too down. He has that."