By Alyssa Adams

PHILADELPHIA (CBS) — Eagles defensive end Brandon Graham reportedly suffered an Achilles injury during Sunday’s loss to the San Francisco 49ers, a source tells Derrick Gunn. Gunn reports that Graham is done for the year.

Brandon Graham confirmed on Twitter he will be watching his team from the sidelines for the rest of the season.

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“We still about to shock the world! I will just be leading from the sidelines this year working to be great for 2022,” Graham tweeted. “Appreciate all the love and now it is time for guys to step it up. U have to find the treasure in every situation!”

“From what I’m told Brandon Graham done for the year… Achilles,” Gunn tweeted Sunday afternoon.

Graham suffered the injury late in the second quarter and walked cautiously to the cart before heading to the locker room.

Head coach Nick Sirianni didn’t confirm the injury but says he is “fearful of what it might be” and that the team is “concerned.”

“With Brandon Graham, we’re fearful of what it might be, but we don’t know for sure yet, so I don’t want to say,” Sirianni said in a post-game press conference. “Obviously, we’re concerned. He’s such a good leader on this football team. If we are without him, it will be a big blow. He’s a great football player and a great leader obviously one of our captains so we’re fearful.”

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Fletcher Cox said it was emotional watching Graham leave the field.

“I mean it’s always tough and pretty emotional for me to see BG limp off the field,” Cox said. “Me and Brandon played so much ball together and to see him walk off the field was pretty rough for me.”

Fletcher continued to say that injuries happen, but Graham has been his locker mate since he got to Philly, while he won’t be able to laugh and talk with him on the field he’s looking forward to doing it in the locker room.

Eagles guard Brandon Brooks left Sunday’s game with a chest injury. He did not return.

In a post-game press conference, Sirianni did not have any updates on Brooks’ injury.

The Eagles loss 17-11 to the San Francisco 49ers on Sunday. They head to Dallas next week to play the Cowboys in a Week 3 Monday night showdown.

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Stay with CBSPhilly.com for updates to this developing story.