The Philadelphia Daily News confirms Zach Ertz will undergo a "procedure" to repair his torn groin.

"I'm very worried," 973espn.com Eagles insider John McMullen stated.  "This is bad news, people don't understand cause Chip kind of downplayed it."

Eagles head coach Chip Kelly announced today that Ertz will miss the entire preseason with a "core muscle injury" in his groin.

“I think he’ll be back for Week 1 but right now he’s out,” Kelly said. “It’ll be a couple of weeks with him, but he's not going to play in the preseason.”

The loss could be a big one for the Eagles if Ertz is lost for any significant amount of time, with a young receiving core, just in his third season, Ertz is one of the veteran pass-catchers on the roster with second year wideout Jordan Matthews and Josh Huff, plus rookie Nelson Agholor being counted on to replace Jeremy Maclin's production.

"He might be their best catcher," McMullen stated. "They were counting on him because they have a lot of youth."

Kelly mentioned that Ertz visited Friday with Dr. William Myers, who has performed several sports hernia surgeries on players all across the NFL.

(Listen to John McMullen discuss Zach Ertz on the Sports Bash)