The Rams appear to have a nice core behind center: quarterback Nick Foles and running backs Todd Gurley and Tre Mason.

Who will block for them remains the big question heading into 2015. The team used five draft picks in the 2015 NFL Draft on offensive linemen to shore up a unit that allowed 47 sacks in 2014, eighth highest in the league.

The two presumed starters will be Greg Robinson at left tackle, who started 12 games last season, and Rodger Saffold at left guard, who is entering his sixth season.

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The center, right tackle and right guard position are up for grabs, although reports out of training camp have draft picks Rob Havenstein (right tackle) and Jamon Brown (right guard) in line to start.

Centers Tim Barnes (four career starts), Barrett Jones (zero career starts) and Demetrius Rhaney (missed all of last season due to injury) have rotated reps with the first team.

The turnover is something Foles is accustomed to, going back to his days at Arizona. Even in Philly last season, the starting offensive line saw five different lineups in his nine starts.

"I've always felt like there's going to be change up front, and I've gotten used to that," Foles told Yahoo! Sports. "It's my job to help get those guys ready to do their job so I can do mine. That way we're working hand in hand."

Certainly it is the quarterback's job to have everybody on the same page. But translating that to in-game situations is a lot different than practicing in training camp.

There could be some growing pains early on in the Rams' season, starting in Week 1 with a matchup against the Seattle Seahawks defense.

(h/t Yahoo! Sports)