EARTH CITY, Mo. -- The St. Louis Rams will officially open their version of organized team activities on Tuesday, making them the last in the league to do so.

Tuesday's session is not open to the media, so we won't get a chance to see the Rams on the field until the first open session on Thursday. But as the OTAs finally begin, here's some things I'll be looking for.

Whither Bradford: According to the team, quarterback Sam Bradford has been well ahead of schedule in his rehabilitation from a torn anterior cruciate ligament in his knee. Bradford has been moving around and throwing for awhile now and there are realistic expectations he will participate in OTAs.

The question doesn't seem to be whether Bradford will participate but the extent of that participation. It's unlikely he'll be at 100 percent or be asked to do everything since there's no need to rush him back, but his presence will likely be felt. It's no secret 2014 is an important season for Bradford. Every rep counts but the last thing the Rams want to do is rush him and risk a possible setback to his return.

Line dancing: The status of left tackle Jake Long participating in OTAs is up in the air. Long's surgery didn't take place until January, so it's only natural that he'd be further behind in his own knee rehab. The Rams have remained insistent that Long can and will be back for the regular-season opener but in the meantime, someone is going to have to take the snaps at left tackle.

The most obvious options on the roster are rookie Greg Robinson and Rodger Saffold, who are projected to start the season at left and right guard, respectively. Indications from the Rams are that both players will get some reps at left tackle during OTAs and into training camp so the Rams can have a couple of options ready to go in the event that Long can't. We'll be sure to monitor how those reps are divvied up, and keep an eye out for Long to see if he does any work on the side during these early summer sessions.

Beyond that, there are plenty of other offensive line issues to watch, including the development of interior swingman Barrett Jones and the return to health of center Scott Wells.

Sorting out the secondary: The top five defensive backs heading into OTAs appear to be pretty well set with Rodney McLeod and T.J. McDonald at safety and Janoris Jenkins, Trumaine Johnson and Lamarcus Joyner (nickel) expected to handle the primary duties in the secondary.

But the Rams have a lot to sort out beyond that group as they look to set the roster for next season. Assuming the Rams keep nine or 10 defensive backs, that would leave room for four or five more defensive backs. At corner, there will be plenty of competition amongst a group that includes Brandon McGee, E.J. Gaines, Greg Reid and some other youngsters including Marcus Roberson. At safety, names like Maurice Alexander, Matt Daniels, Cody Davis and Christian Bryant will jockey for position.

Williams' wrinkles: New defensive coordinator Gregg Williams has spent most of the offseason in the lab coming up with ways to deploy his new players. But most of that has been based off film study without the benefit of seeing his players working up close on an actual football field.

OTAs offer Williams his first chance to do just that and make determinations on how he wants to go about using the talent in place. The majority of work in OTAs is centered on installation on both sides of the ball so much of the legwork is already done, but there is plenty of time for tweaking if, for example, Williams views his players' skill sets different than he first suspected.

Likewise, it will give the defense its first chance to get used to what Williams wants to do and get comfortable with what will likely be a more aggressive approach in 2014.

Receiver rundown: Aside from the free-agent addition of Kenny Britt, the Rams stood pat at wide receiver in the offseason, choosing to bet heavy that their young receiver corps will be up to the task of taking the next step up the developmental ladder.

Chris Givens, Tavon Austin, Stedman Bailey, Brian Quick and Austin Pettis return to the fold. Much is expected from Givens, Austin, Bailey and Quick, and Britt will get a chance to make a positive first impression on the field. The competition appears mostly wide open, making receiver a position full of intrigue as we head toward training camp.