Brandon Jacobs has announced his retirement from football.

"I've had an amazing run and I appreciate all of the support from the fans through the good and the bad," Jacobs said in a statement. "The New York Giants are a great organization and I am proud to have been a part of it for so long." A bruising, powerful runner, Jacobs is hanging up his cleats after nine years in the league. He underwent a "rare" knee procedure last month, and had been plagued by knee woes each of the past two years, totaling just 63 carries. The "Earth" in New York's former Earth, Wind and Fire trio, Jacobs retires having averaged 4.5 yards on 1,141 career totes. It's a sensational number. Jacobs had 1,000-yard years in 2007-08.

Impending free agent Brandon Jacobs (knee surgery) needs four months of rehab.

Jacobs underwent a rare knee procedure earlier this month. He says he'll only come back to the Giants, but it's unlikely he has enough left in the tank to make the team. Jacobs will turn 32 in July and has a total of 63 carries in the last two seasons.

Brandon Jacobs' left knee surgery included a "cartilage graft to repair osteoarthritis."

In other words, it wasn't just a simple scope. Jacobs showed enough this season to at least get a camp invite for 2014, but it's quite possible his knee and advancing age will kill his roster hopes.

Brandon Jacobs (injured reserve) is currently having his knee scoped.

The good news is Jacobs is having the knee scoped as opposed to a microfracture procedure. He'll have a chance to catch on with a team in 2014. Jacobs will be 32 years old by the start of next season, but racked up 238 yards and three touchdowns on 58 carries (4.10 YPC) this year. He's got some power, juice, and tackle-shedding ability left, even if it isn't much.

Giants placed RB Brandon Jacobs on injured reserve with a knee injury, ending his season.

Jacobs has carried the ball just 14 times since he toted it 22 times in Week 6 against the Bears. He's missed five of the Giants' past seven games and recently admitted that his knee is nowhere near 100 percent, adding that he'll need a clean-out procedure in the offseason. Jacobs can go ahead and get it now. In seven games with the Giants this season, Jacobs rushed for 238 yards and four touchdowns on 58 carries. He'll turn 32 next July. Jacobs' career may be finished. The Giants were the only team willing to sign him in 2013.

Giants declared RB Brandon Jacobs, DE Jason Pierre-Paul, CB Corey Webster, QB Ryan Nassib, LB Allen Bradford, OL Stephen Goodin, and TE Adrien Robinson inactive for Week 14 at San Diego.

Jacobs (knee) made the trip to Qualcomm, but was never expected to play after being listed as doubtful. JPP and Webster are also hurting.

Brandon Jacobs (knee) is listed as doubtful for Week 14.

Although Jacobs has very little standalone fantasy value, his absence locks in Andre Brown as the Giants' goal-line back. Since returning from short-term I.R. four games ago, Brown is the No. 7 overall fantasy running back, and is a legit RB1 in Sunday's tilt with San Diego. Rotoworld's Pat Daugherty ranks Brown as the No. 9 fantasy back for the first round of the fantasy playoffs. A link to RotoPat's full Week 14 rankings is accessible below.

The Giants are "hopeful" Brandon Jacobs (knee) can resume practicing on Friday.

The "hope" comes from coach Tom Coughlin. Even if Jacobs suits up Friday, he'll be no better than 50-50 to play against the Chargers. Our guess is that Peyton Hillis will back up Andre Brown in San Diego. Jacobs' status will be updated on Friday.

Brandon Jacobs (knee) is not practicing Thursday.

Jacobs hasn't played since the Dallas game back on Nov. 24. Peyton Hillis will back up Andre Brown against the Chargers Sunday.

Brandon Jacobs (knee) has been ruled out for Week 13.

Jacobs rushed for 75 yards off the bench last week, but has chronic knee problems at this stage of his career and couldn't make it through the ensuing practice week without a setback. Expect Peyton Hillis to get a game-day helmet behind Andre Brown. Jacobs' absence is good news for Brown's Week 13 fantasy outlook because the washed-up veteran had been a threat for goal-line carries.

Brandon Jacobs (knee) missed Giants practice on Friday.

Per the NY Daily News' Mitchell Abramson, Jacobs' absence was a "bad omen" for his chances of playing Sunday. If Jacobs is inactive, the Giants would likely activate Peyton Hillis to be Andre Brown's change-of-pace back.

Brandon Jacobs (knee) is not practicing Wednesday.

Jacobs never practices on Wednesdays as he manages his chronically sore knee. He's rushed 14 times for 84 yards with one touchdown in two games since Andre Brown returned to the lineup.

Brandon Jacobs rushed nine times for 75 yards in the Giants' Week 12 loss to Dallas.

Jacobs ran through some of the biggest holes you'll ever see against a Cowboys defense missing ILB Sean Lee, but failed to finish the run down near the goal line on his long gain, a 37-yarder. Jacobs hasn't suddenly come back to life. He's a breather back and sometimes-goal-line vulture who's comfortably behind Andre Brown on the depth chart. The Giants face the Redskins next.

Brandon Jacobs is active for Week 12 against the Cowboys.

He'll serve as the goal-line specialist behind Andre Brown.

Brandon Jacobs (knee) is listed as questionable for Week 12.

Jacobs was also listed as questionable for Week 11 against Green Bay. He went on to play and vulture a goal-line touchdown from Andre Brown. We suspect Jacobs will be active again this week. He just isn't a fantasy option.

Brandon Jacobs (knee) returned to practice Thursday.

Jacobs managed his chronically sore knee by sitting out Wednesday. He'll be fine to serve as a short-yardage and goal-line option behind Andre Brown against the Cowboys.

Brandon Jacobs (knee) will not practice Wednesday.

It's likely just a day off for Jacobs to manage his chronically sore knee. He should be fine to serve as the short-yardage and goal-line complement to Andre Brown against the Cowboys Sunday.

Brandon Jacobs rushed five times for nine yards and one touchdown in Week 11 against the Packers.

Brandon Jacobs (knee, hamstring) is listed as questionable for Week 11 against the Packers.

Jacobs returned to practice Thursday after being sidelined since Week 6. He won't be anything more than the No. 3 back upon his return, anyway. Andre Brown is going to carry as much of the load as he possibly can down the stretch.

Brandon Jacobs (knee, hamstring) returned to practice Thursday.

Jacobs chronic knee issues and long recovery from a seemingly minor hamstring pull have left him third on the depth chart. Andre Brown is going to carry the mail as much as possible going forward.