Posted by: Chris Vannini on January 3, 2013

There are many inside the NFL who don't believe Chip Kelly's offense will work in the NFL.

Count former Steelers running back Jerome Bettis in that group.

With Kelly reportedly set to interview with NFL teams this weekend, Bettis was asked on The Tim Brando Show about Kelly's offense translating to the pros, and Bettis was skeptical.

"I'll tell you this: He's not going to be able institute that type of offense 100 percent," Bettis said. "It will have to be similar to the Washington Redskins. They do it sparingly; they do some things in that area. They don't do a whole lot because the problem you have is, as the Redskins found out, when your quarterback gets hurt, now the backup quarterback, if he's not familiar, you've got to change the offense.

"I don't think you're going to see that wholesale commitment to that type of offense, because if you do, that means you've got to institute your starting quarterback that way, your backup quarterback and your third-string quarterback, and that's going to be very difficult to be that one-dimensional in the NFL.

"It's such a dangerous proposition with your quarterback running the football. I don't think you can do that 100 percent of the time."

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Chris Vannini is the lead writer for CoachingSearch.com and has covered Michigan State sports for The State News, The Oakland Press and MLive.com. He writes a weekly column for the Detroit Free Press on behalf of SB Nation. Vannini lives in Big Ten country, so his foot speed is far from SEC caliber, but his pulse on coaches is hard to match. Be sure to follow @CoachingBuzz on twitter and send your feedback to chris@coachingsearch.com