DeSean Jackson has already received interest from six teams following his release by the Philadelphia Eagles.

The Eagles were unable to trade Jackson when they shopped him for multiple weeks.

The San Francisco 49ers, New York Jets and Seattle Seahawks expressed interest in Jackson via trade.

Ron Rivera has publicly said that the Carolina Panthers are interested in Jackson.

The San Francisco 49ers, Seattle Seahawks and New York Jets expressed interest in DeSean Jackson when the Philadelphia Eagles attempted to trade him before his release. Those teams could be interested in Jackson as a free agent.

The New England Patriots and Oakland Raiders could also be interested in Jackson.

Jackson is one of the NFL's most talented playmakers at wide receiver, so it will be interesting to gauge his market in light of reports of his off-field issues.

The working relationship between Jim Harbaugh and Trent Baalke seems to be going well this offseason as evidenced by the trades for Blaine Gabbert and Jonathan Martin.

"A lot has been made about the relationship between Trent and I and it’s good; we don’t like to talk about it that much ‘Trent and Jim,’ you know? This is a team effort here," said Harbaugh.

"This is an organization where you’ve got a lot of coaches that are putting in a lot of work when it comes to evaluating free agency or the draft, same on the personnel side. Trent has a great staff; they work extremely hard at it.

"Just to say, talk about it just me and Trent… it’s a team effort. I’ve heard Trent say the same thing and I couldn’t agree more.

"But yeah, working very well together, to answer your question."

Harbaugh also said he's interested in remaining with the San Francisco 49ers.

"Yeah, I mean, I love coaching this team; I love the players, I love the coaches and the organization that I serve. And want to be here for a very long time."

The San Francisco 49ers hope to sign Colin Kaepernick to a contract extension before the start of training camp.

Trent Baalke told reporters at the NFL owners meetings in Orlando, Fla., that the 49ers would like to get the deal done before training camp starts in late July.

"We're going to work extremely hard, very diligently in trying to get something done prior to training camp. That's the objective right now, as it stands," Baalke said, according to Comcast Sports Net Bay Area.

"I think there's a lot that he's done that has put him in that position where he should be paid like one of the top quarterbacks in the league," 49ers CEO Jed York said, according to Comcast Sports Net Bay Area. "And I think that's where we'll end up -- whether we get it done now or later. We hope we get it done soon. If we don't, I don't think it's going to be acrimonious."

Kaepernick likely will command a contract that averages in the $18 million to $20 million range.

The San Francisco 49ers and Colin Kaepernick could agree upon a long-term extension this offseason.

Kaepernick is scheduled to earn $1.073 million in 2014. Backup quarterback Blaine Gabbert has a guaranteed contract of $2.011 million.

“Those things have a process that play out.,” Harbaugh said. “The priority is Colin Kaepernick is a San Francisco 49er for however long we can have him be a San Francisco 49er. It’s definitely a high priority.”

Kaepernick threw for 3,197 yards with 21 touchdowns and eight interceptions in 2013. He also rushed for 524 yards.

“Amazing individual. Amazing player,” Harbaugh said. “He shows up and works all the time. There’s really nobody to compete with him in a workout situation. He will bury everybody. And then when somebody tries to compete with him, he just ramps his competitiveness up and somebody’s over there on a knee throwing up.

“He’s unbelievable. As you can tell, I think he’s a special and great player. So it’s a high priority.”

The Carolina Panthers reached out to the Philadelphia Eagles about the availability of DeSean Jackson.

The Oakland Raiders, New York Jets, New England Patriots and San Francisco 49ers are the other teams that have expressed interest.

The Eagles have not responded to Jackson trade rumors, indicating Chip Kelly would like to part ways with the talented wide receiver.

Vic Fangino has been given a contract extension and pay raise as defensive coordinator of the San Francisco 49ers.

Jim Harbaugh publicly lobbied 49ers management and ownership to give Fangio a bump in pay in comments to Sports Illustrated on March 3.

The 49ers have finished in the top five in yards allowed and points allowed in each of Fangio’s three seasons in charge of the team’s defense.

The Philadelphia Eagles are listening to trade offers for DeSean Jackson, according to sources.

The San Francisco 49ers and New England Patriots are among the teams that have inquired about Jackson.

The Eagles are seeking at least a third round pick for Jackson, who had 1,332 yards last season.

Julian Edelman will visit with the San Francisco 49ers on Friday.

Edelman is a native of the Bay Area and caught 105 passes for 1,056 yards and four touchdowns last season wth the New England Patriots.

Hakeem Nicks is also of interest to the 49ers.

The San Francisco 49ers will acquire Jonathan Martin via trade with the Miami Dolphins.

The Dolphins will acquire a 2015 seventh round pick in 2015 if he remains on the 49ers' opening 53-man roster.

Martin played for Jim Harbaugh at Stanford.

The 49ers like to use a lot of sets features six offensive linemen.

Martin left the Dolphins in late October following a bullying incident involving Richie Incognito.