Ball now in Broncos' court with RB C.J. Anderson

— -- The Dolphins have signed Denver Broncos restricted free-agent running back C.J. Anderson to a four-year, $18 million offer sheet, a league source told ESPN NFL Insider Adam Schefter. 

Already having watched quarterback Brock Osweiler ( Texans), defensive end Malik Jackson ( Jaguars) and linebacker Danny Trevathan ( Bears) depart in free agency, the Broncos now have five days to match the offer sheet, which includes $10 million guaranteed.

The Broncos are limited in what they can do given their pursuit of several options at quarterback, including a potential trade with the 49ers for Colin Kaepernick, a potential free-agent visit by former Redskins quarterback Robert Griffin III and trying to secure a long-term deal with star linebacker Von Miller.

On Thursday, Anderson visited Miami, where former Broncos offensive coordinator Adam Gase is now the head coach. Gase knows Anderson well and has lauded the running back's potential as a full-time runner.

Several teams reportedly were interested in the 25-year-old Anderson, including the Patriots and the Bears. He was tendered a one-year, $1.671 million deal, with the Broncos holding right of first refusal. That means the Broncos can match any other offer, but they also won't receive compensation if they don't.

Anderson made the Broncos' roster as an undrafted rookie out of California in 2013.

He was an injury replacement in the Pro Bowl following a 2014 season that saw him rush for 849 yards and eight touchdowns. He gained the bulk of those yards with his work down the stretch.

This past season, Anderson battled some injuries and was in a rotation with Ronnie Hillman. He finished the season with 720 yards on 152 carries (4.7-yard average) and 5 touchdowns. He had 90 yards rushing and one touchdown in the Broncos' 24-10 win over the Carolina Panthers in Super Bowl 50.

Following that win, Anderson said: "I'd like to stay, we just played in the Super Bowl, we've won the division every year I've been with the team, but it's two sides -- they have to want you to stay. I believe in my abilities and believe it will work out."

Hillman (863 rushing yards, seven touchdowns in 2015) also is an unrestricted free agent.

The Dolphins are looking to fill the void left by former starter Lamar Miller, who officially signed with the Houston Texans as a free agent on Thursday.

Information from ESPN.com's Jeff Legwold was used in this report.