The Ravens will take the practice field today for the first of three, three-day organized team activities. One of the three each week will be open to reporters who will document who is in attendance, what kind of shape certain players appear to be in and whether certain players are working with the first or second teams.

While many of the veterans opt to attend, there will be some players who stay away, and that’s certainly within their right. The workouts are voluntary and plenty of past Ravens stars – like Ray Lewis and Ed Reed – and current ones – Haloti Ngata and Terrell Suggs – don’t traditionally attend OTAs.

Then, there are other players who aren’t allowed to practice or work out due to an offseason surgery or an injury sustained last year that still hasn’t fully healed.

Here’s a look at some of the Ravens that take injury question marks into the various offseason minicamps:

Michael Campanaro, WR: The seventh-round pick, who played his college ball at Wake Forest after a standout prep career at River Hill in Clarksville, tweaked his hamstring during the rookie minicamp earlier this month. It’s not considered serious, but the Ravens will obviously proceed with caution, not wanting the injury to linger into training camp.

Terrence Cody, NT: Re-signed in April, Cody had both hip and elbow surgeries last offseason and the hip discomfort has been an ongoing problem. There was some question about whether Cody would need an additional procedure on his hip this offseason. However, Cody said last month that nothing was planned and he feels healthy and ready to go. He’ll need to have a good training camp to find a role in the Ravens’ deep defensive line rotation.  

Owen Daniels, TE: Daniels missed the final 11 games of the 2013 season after suffering a fractured leg with the Houston Texans. The injury, though, appears to be behind him. Daniels passed the Ravens’ physical and has been participating in team workouts at the Under ArmourPerformance Center. There’s no indication that he’ll be limited in any way in the workouts.

Adrian Hamilton, OLB: The pass-rushing specialist was placed on injured reserve with a wrist injury last August, missing the entire 2014 season. He was surprisingly not in attendance at the rookie minicamp, which he was eligible to participate in. All indications are that he’s healthy. He’s going to need a big offseason to make the roster.

James Hurst, OT: The only reason that the steady North Carolina lineman went undrafted earlier this month was that he broke his leg in his team’s bowl game in late December. Five months later, Hurst was on the field and participating in the Ravens’ rookie minicamp, moving pretty well. The Ravens, who are excited about Hurst, aren’t going to push the rookie too hard, but all signs have been good so far.

Kapron Lewis-Moore, DE: One of the most pleasing developments for Ravens’ officials at the rookie minicamp was the sight of Lewis-Moore getting off blocks and flying to the ball. The formerNotre Dame standout was a sixth-round pick last year after he tore up his knee in the BCS national championship game. Last season was essentially a redshirt year for him, but he’s now healthy and ready to try and crack the Ravens’ defensive line rotation.

Aaron Mellette, WR: A seventh-round pick last year out of Elon, Mellette showed some promise in training camp but he was ultimately shut down to get surgery on his knee. He’s done all the rehab work and he should be ready to go this week. The competition for the final one or two receiving spots will be tight and Mellette is going to need to be at full strength.

Kelechi Osemele, OG/OT:  Ravens head coach John Harbaugh said earlier this month that Osemele has been working out and has been “100 percent” in what the team has asked him to do after season-ending back surgery last November. If he’s healthy, Osemele will start at either left guard or right tackle. But though all signs are good about his readiness, the Ravens will proceed with caution with the big, third-year offensive lineman.

Bernard Pierce, RB: It is not expected that Pierce will be able to fully partake in any of the pre-training camp workouts. Pierce had rotator cuff surgery in January and while Harbaugh said that he’s making progress, he’s still relatively limited in what he can do. The best case scenario appears to be Pierce being ready for training camp in July.    

Brent Urban, DE: Urban, a rookie fourth-round pick, had ankle surgery in February and watched the rookie minicamp from the sideline. He should become more and more involved in the workouts as the offseason progresses. He should be ready to return no later than training camp, if not sooner.