It might take first- and third-round draft picks to acquire Marshall, one of the top young wide receivers in the game, but he would immediately shore up an area that is considered a weakness for the Ravens.
The Chicago Bears, who traded for Denver quarterback Jay Cutler this offseason, also might be interested in Marshall. It's not known whether the Broncos are considering trading Marshall, but they dealt Cutler when he asked them to.
Nicknamed "The Beast," Marshall has caught more than 100 passes each of the past two seasons. The major concern with Marshall is his lengthy list of off-the-field issues, which includes 13 police incidents since 2004 and a pending misdemeanor battery charge.
"We're interested in anybody that can help our team," coach John Harbaugh said Tuesday. "He [Marshall] plays for the Broncos, and he's under contract. He's not a guy that we're concerned with right now. We'll just have to see what happens."
Marshall requested a trade from the Broncos after skipping mandatory minicamp last week. His holdout is the result of medical trust issues with the Broncos (he said the team misdiagnosed his hip injury last season) and a desire for a new contract.
Marshall's agent, Kennard McGuire, couldn't be reached for comment, but Marshall addressed his trade request on his Web site, writing: "To whom it may concern. Life is filled with change, and where I am in my life now change is probably best. It's hard leaving an organization ran by one of the best owners in all of sports, and someone who's been there for me through my ups and downs. The hardest thing was hearing Mr. B [Pat Bowlen] wish me luck in the future, but we both came to the conclusion that this is probably the best thing for me to grow on and off the field.
"I thank the Denver fans who embraced my emotion and play on the field and showing me love every time I step outside my door."
If traded, Marshall, whose contract expires after the season (unless the NFL goes into an uncapped season), would probably seek a deal averaging $9 million per season.
This could be a risky move based on Marshall's legal history, which includes charges ranging from domestic violence to driving under the influence to retail theft.
Marshall faces a trial this summer on two misdemeanor battery charges stemming from an altercation with his former girlfriend.
"Their background matters," Harbaugh said. "We want to bring guys in here that are what we consider Ravens. So, any player that we bring in here, we've got to be convinced that he's a man of integrity, a high-character guy, and that our players can respect him in the locker room. That's going to be true whether it's in a draft or free agency or any guys we choose to re-sign. We look at that real hard because we think those are the type of people that you win with, and we're never going to compromise on that."
Another issue with Marshall is his health. He had hip surgery March 31 and hopes to be ready by the start of training camp in late July.
But Marshall has been rehabilitating his hip at his Orlando, Fla., home because of his problems with the Broncos' medical staff.
On his Web site, Marshall wrote: "It's kind of funny now but some of my coaches thought I was getting 'big-headed' and just didn't want to practice but I needed some fine-tuning.
"What made last year so weird was that I got two MRIs, one in camp and the second around week six and was told nothing was wrong but come to find out THERE WAS A BIT OF A PROBLEM after all."
Still, this could be the Ravens' best chance at adding a big-play receiver. Marshall, 6 feet 4, 230 pounds, would appear to be a perfect fit for the Ravens, who could team him with strong-armed quarterback Joe Flacco for the next decade.
In his three-year career in Denver, Marshall has caught 226 passes for 2,899 yards and 15 touchdowns and built a reputation for breaking tackles for long gains.
There are question marks regarding the Ravens' receivers. The top three - Derrick Mason (shoulder), Mark Clayton (foot) and Demetrius Williams (ankle) - have missed significant time in offseason minicamps.
SOME OF MARSHALL'S OFF-THE-FIELD INCIDENTS
June 17, 2006: Marshall and girlfriend Rasheedah Watley filed police reports alleging physical abuse by the other in an hours-long fight at Marshall's Orlando, Fla., apartment. No arrests.
Jan. 24, 2007: Police interviewed Marshall and his father after an argument in an Orlando parking lot. Marshall claimed his father tried to hit him with his car, while the father told police Marshall had fired a gun. Both declined to press charges.
March 18, 2007: Watley told Atlanta police Marshall had punched her and taken her purse while at a downtown hotel. Marshall left before police arrived, and no charges were filed.
March 26, 2007: Marshall was arrested in Highlands Ranch, Colo., on charges of domestic violence and false imprisonment after another argument with Watley. Charges were dropped.
June 8, 2007: Two incident reports were filed by Atlanta police. The first was to investigate damage to private property when Watley's friend alleged Marshall hit her car and then threw a rock at the passenger door, near where Watley was riding. In the other, Watley told police Marshall had cut her in the thigh and punched her in the face. She was taken by ambulance to a local hospital. Marshall was not on the scene, and no charges were filed.
Oct. 22, 2007: Marshall was arrested and charged with DUI after he allegedly drove the wrong way on a one-way street in downtown Denver, hours after a Broncos game.
March 4-6, 2008: Three incident reports and one criminal warrant were filed after Watley and Marshall got into a fight at his Atlanta condo. She told police Marshall had punched her in the mouth and eye. Marshall told police his hand was also cut on glass during the incident, which also involved Watley's two younger sisters. Marshall was arrested March 6 on a misdemeanor battery charge. Formal charges have not been filed.
March 1, 2009: Marshall was arrested in Atlanta on suspicion of disorderly conduct after allegedly fighting with his fiancee, Michi Nogami-Campbell. Marshall was released on $300 bond. Charges were dropped the next day.
Compiled from reports in the Denver Post