"It's not for everybody" - Lions HC on rookie's retirement from the NFL 

Detroit Lions' undrafted free agent tackle Zein Obeid decided to retire from the NFL this past week.

The 6'4", 310-pound offensive tackle was one of 12 undrafted free agents who signed for the Detroit Lions following the draft, but decided to call it quits.

Head coach Dan Campbell was asked by the media about Obeid's unusually early retirement. Campbell stated that the game is not for everyone.

“I know why you’re asking it. I mean, because it is the obvious,” Campbell said, via Kyle Meinke of MLive.com. “But I just feel like it’s, you know, everybody’s different. [The NFL’s] not for everybody.

"Not everything is easy about it, and it’s not just about football. I wish [Obeid] the best of luck. He’s a great kid. He was a grinder. He worked. On with the next endeavor.”

After Obeid's announcement, the team signed tackle Kendall Lamm to shore up the roster.

Why did Zein Obeid retire from the NFL?

Dan Campbell during NFL Combine

According to reports, Obeid retired for undisclosed reasons. He became the third member of the Detroit Lions’ 12-man UDFA class to call it quits and also the fourth Lions player overall to retire this offseason.

Undrafted rookies Corey Sutton and Jermaine Waller also decided to walk away this offseason, with John Penisini, a third-year defensive tackle, following suit.

When asked about the recent string of retirements and how the Lions assess players' passion for the game, Dan Campbell said:

"That’s something that Brad (Holmes) is always real critical about for himself,” Campbell said. “No different than we are as coaches as it pertains to the football side. We’re going to look at everything, believe me.

“Now, I’ll say this: Three of the four were, from the time they got here, you would have never guessed something like this. To each his own, and everybody is different. But these guys did everything right. They worked hard. And it just, hey, they felt like it wasn’t for them. All good.”

Pre-season begins this weekend for the Lions. They will certainly be hoping that Lamm works out well for them, so they don't have to continue filling in voids for players retiring early.