Carson Wentz said Philadelphia Eagles fans have every right to be frustrated but the embattled quarterback is confident he can return to form.

Wentz struggled as the Eagles – Super Bowl LII champions – dropped to 5-6 for the NFL season following last week's 17-9 loss to the high-flying Seattle Seahawks.

The under-fire QB finished 33 of 45 for 256 yards, a touchdown and four turnovers – two interceptions and two lost fumbles – to headline Philadelphia's woes.

Wentz, who has overcome a bruised right hand ahead of Sunday's clash with the Miami Dolphins, understands how the team's supporters are feeling.

"They have a right to be frustrated," Wentz told reporters on Wednesday. "They pay money to sit in those seats. They pay money to cheer us on, and they're so passionate about it. And I'm the same way. So when they're frustrated, I'm frustrated, too."

Asked whether it has been harder to play stress-free over the past couple of weeks, Wentz said: "Not really. Just because, shoot, there's always stress, there's always pressure, there's always that stuff.

"For me, just to be confident in who I am, the good, the bad, the ugly. I don't really get caught up in what people say, think, whether it's good, whether it's bad. I'm confident in who I am as a player. 

"You're going to go through highs and lows, you're going to go through peaks and valleys. For me, just being confident in who I am as a person, as a player and as a man of God. That's really all that matters. 

"I have so much confidence in my ability to turn this around and do my best and get these things fixed, that I don't get too high or too low going through these things."

Meanwhile, the Eagles signed kicker Jake Elliott to a five-year contract extension through to 2024.