Inside linebacker Brandon Marshall remains undecided if he will skip any of the Broncos offseason workouts as he seeks a long-term contract. Marshall has not signed his second-round tender contract, which pays him $2.553 million. The contract represents a huge raise from last season’s $495,000, and dissuaded teams from signing him to an offer sheet because of their reluctance to surrender a second-round draft pick.

Voluntary team workouts begin April 18. Marshall said Wednesday he’s unsure if he will attend. Agent Drew Rosenhaus, who represents Marshall, declined comment in an email. Mandatory camp is expected to start in the middle of June. Marshall wants a long-term contract with the Broncos. The Broncos view him as a potential core player but securing him to a multi-year contract is complicated by the timing.

The Broncos’ priorities remain signing Super Bowl 50 most valuable player Von Miller to a long-term deal and finding another quarterback to compete with Mark Sanchez for the starting job.

“We look forward to signing Von up for several more years and I bet he’s looking forward to it. He’s kind of come into his own as a person,” Broncos president Joe Ellis said last week.

The Broncos have less than $2 million in salary cap space, though that figure could increase with a trade of left tackle Ryan Clady. Broncos coach Gary Kubiak said last week he “expected everybody there” when Denver begins workouts next month. With the loss of free agent linebacker Danny Trevathan, Marshall projects to play an even bigger role in Denver’s defense. He could move to Trevathan’s linebacker spot, Kubiak said, with Todd Davis and others competing for his position.

Footnotes. Broncos defensive back Omar Bolden was scheduled to fly to Chicago on Wednesday and meet with Chicago Bears officials on Thursday, hopeful of securing a contract. Several Broncos have joined ex-Denver coach John Fox in Chicago, including Manny Ramirez, Aaron Brewer and Trevathan. … USA Today reported the Green Bay Packers have expressed an interest in free agent running back Ronnie Hillman. … Defensive lineman Robert Nkemdiche, quarterbacks Dak Prescott and Jeff Driskel and Colorado receiver Nelson Spruce are among draft prospects scheduled to visit the Broncos, according to Walterfootball.com.

Troy E. Renck: trenck@denverpost.com or @troyrenck