ENGLEWOOD, Colo. -- As if the Denver Broncos didn’t have enough questions on offense, where a makeover of the offensive line is expected to be their offseason priority.

The team's trainers remain busy in the offseason, with the majority of the Broncos' major injury questions on offense as well. And with the scouting combine a week away, the Broncos will find themselves framing some of their decisions based on their medical updates over the weeks and months that follow.

The Broncos have four players who were starters at times this past season who are among those being monitored at the moment. Quarterback Trevor Siemian had surgery on his left (non-throwing) shoulder just after season’s end, center Matt Paradis has had separate surgeries on each hip already this offseason, running back C.J. Anderson continues to work back from late October knee surgery and fullback Andy Janovich has been recovering from an ankle injury that put him on injured reserve to close out the season.

In recent weeks, Broncos coach Vance Joseph said he had "good reports" on all of those players.

"But you always have your eye on guys coming back from things," Joseph said. "We’re going to do what’s best for those guys bringing them back, and as we put the roster together we’ll have all the information we need."

Trevor Siemian isn't expected to throw in full-speed workouts until OTAs in May. Christopher Hanewinckel/USA TODAY Sports

Siemian has been working with the Broncos’ trainers since his surgery and recently made an appearance for the team without a sling on the repaired shoulder. He is expected to be able to throw at least some in a practice setting by the time the Broncos have their first set of organized team activities in May but is not expected to be ready to throw in a full-speed workout before then.

While the surgery was on his non-throwing shoulder, it does impact his ability to set up and his delivery. Joseph, as well as executive vice president of football operations/general manager John Elway, have said they expect Siemian and Paxton Lynch to battle for the starting job.

Paradis’ full return may not come until training camp or beyond. He just had the second of two hip procedures since the season ended. He has consistently said he expects to be back for the regular season, or "as fast as I possibly can without setting myself back. I only want to go through this all once," Paradis said. Paradis has known, even as far back as when he was at Boise State, the surgeries were a possibility, and the pain he played through last season made them a reality.

It is possible, depending on how deep a dive the Broncos take to remake their offensive line in free agency and the draft, that Paradis is the only returning starter up front.

Despite practicing only one or two days a week for much of the 2016 season, Paradis has played every snap on offense over the last two years. His recovery will be watched closely, and the Broncos may have to give a little more attention to their depth at the position.

Guards Max Garcia and Connor McGovern have worked some at center in practice, and Garcia started games at that spot at Florida.

The Broncos believe Anderson will be ready for the offseason program when it opens in April. He has said he’ll be "good to go" for OTAs and training camp. Janovich, too, is expected to be ready for the team’s offseason work.

Offensive coordinator Mike McCoy has used a two-back look plenty in his time as a play-caller or head coach. And both Elway and former coach Gary Kubiak have said they believe Janovich was set to evolve into a key part of the team’s offense in his rookie season before Janovich first fractured his hand and then suffered his season-ending ankle injury.

While Elway has publicly said keeping the team’s defense "great" is an offseason priority, the offense is in line for plenty of work -- because it's needed. It has been a source of frustration from the time Peyton Manning's foot injury surfaced in 2015.

The Broncos were 16th in total offense in 2015, 22nd in scoring that year and finished 27th in total offense this past season and 19th in scoring. And that’s including the fact that the Broncos’ point totals have benefited from four defensive touchdowns this past season to go with five defensive touchdowns in 2015.

"I’ve said we'll do what we need to do, but there’s no question we need to compete better on offense," Elway said. " … We lost some people this season. Trevor had some issues with his shoulder, we lost C.J.; we’ll get everybody healthy make the improvements we need to."