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Marcio Jose Sanchez/Associated Press

Starters: Ryan Clady (LT), Shelley Smith (LG), Gino Gradkowski (C), Louis Vasquez (RG), Michael Schofield (RT)

Backups: Chris Clark, Manny Ramirez, Matt Paradis, Ben Garland, Paul Cornick, Jon Halapio

At this time, three of the five starters on the offensive line are pretty much set.

In a zone-blocking system, left tackle Ryan Clady should perform at an All-Pro level. His footwork makes him an effective blocker on the move, in addition to the high-quality pass protection he provides for Peyton Manning.

In free agency earlier this year, the Broncos added left guard Shelley Smith. Originally a draft pick for Kubiak when he was with the Houston Texans, Smith can step in and start at left guard. He’s a perfect fit for the zone-blocking system and should be a quality starter for Denver so long as he stays healthy.

The center position is up in the air right now. Second-year pro Matt Paradis could be the starter at the beginning of the regular season after spending last year on the practice squad. Paradis is athletic and can be a “sticky blocker” at the second level of the defense.

On Tuesday it was announced the Broncos had traded a fourth-round pick in 2016 to the Baltimore Ravens in exchange for center Gino Gradkowski and a fifth-round pick in 2016. Gradkowski was a backup last year for the Ravens, but Gary Kubiak (and Rick Dennison) got to know him well. A 16-game starter in 2013, Gradkowski struggled to impress but he is arguably the frontrunner for the starting center job with Denver.

Like Clady, right guard Louis Vasquez is a stud who can be an All-Pro selection in 2015. Last season, he was bumped outside to right tackle and was average. Moving back inside to guard is the right move, and he should respond with outstanding play.

The right tackle position might be the biggest question mark on either side of the ball. Like Paradis, second-year pro Michael Schofield has to be penciled in as the starter at this moment. He was not active for a single game last year, but the Broncos believe in their 2014 third-round pick. He’ll get an opportunity to prove he can be a starter this offseason.

The Broncos are likely to select a right tackle with their first pick (28th overall) in the 2015 NFL draft. T.J. Clemmings (Pitt) or Ereck Flowers (Miami) could be an option for Denver as it looks to shore up the starters on the offensive line.

Chris Clark struggled at right tackle last year and was replaced. He’s a valuable swing tackle who is a better fit for the zone-blocking system. Clark should be considered a dark horse to win the starting right tackle job in 2015.

Manny Ramirez can play center or guard for the Broncos, but his power-blocking style is an odd fit in the zone-blocking system. Ben Garland has worked hard to prove himself as an offensive lineman after starting his pro career as a defensive tackle. Paul Cornick and Jon Halapio are reserve players who will compete for a spot on the final roster.