SAN DIEGO – After the long Memorial Day weekend, the San Diego Charger start the beginning of 10 organized team activities (OTAs) on Tuesday.

Tuesday’s practice is the first of three that will be open to reporters. During this on-field work, offense and defense can compete in 7-on-7 passing drills, 11-on-11 team drills and 9-on-7 running drills.

However, practices are non-contact with players in helmets and jerseys. Teams also are not allowed to do one-on-one pass-blocking drills.

With the veterans and rookies working on the field for the first time, here are five things I’ll watch for on Tuesday.

Where’s Weddle? Veteran safety Eric Weddle has indicated he will not report to voluntary workouts due to frustration over lack of negotiations with the Chargers on a contract extension. So it’s unlikely he will be at Chargers Park on Tuesday. However, it’s more likely Weddle reports to the team’s three-day, mandatory minicamp starting June 16 to avoid potential fines.

Safety competition: With Weddle absent, Chargers defensive coordinator John Pagano likely will split the reps at safety among Jahleel Addae, Darrell Stuckey and Jimmy Wilson. Pagano said he likes the speed and athleticism the secondary has played with so far during offseason work, so I’m interested to see what rotations are used at safety with Weddle out.

The starting offensive line: With Joe Barksdale, Orlando Franklin and Chris Hairston all signed during the offseason, what the starting offensive line looks like on the first day of OTAs will be a focal point for reporters. Right now, I would project that the five up front will be King Dunlap at left tackle, Orlando Franklin at left guard, Chris Watt at center, Johnnie Troutman at right guard and D.J. Fluker at right tackle. However, offensive line coach Joe D’Alessandris said the Chargers will look at several offensive line combinations this offseason, and head coach Mike McCoy committed to playing the best five up front. So there will be competition for starting jobs.

What’s Stevie Johnson’s role? With Eddie Royal signing with the Chicago Bears in free agency, the Chargers have to replace his production at slot receiver. Johnson was signed in part to fill that void, so I want to see how well he’s working with quarterback Philip Rivers in the passing game, along with how he’s being moved around on offense.

Melvin Gordon in action: First round selection running back Melvin Gordon’s development will be a point of emphasis this offseason and in training camp. It’s important that Gordon pick up the playbook quickly, along with the way Chargers offensive coordinator Frank Reich wants certain running plays executed and blitz pickup in the passing game. Reich will throw a lot on Gordon’s plate over the next month, and we’ll see how quickly the Wisconsin product can digest the information and make it happen on the field.