Bill Belichick’s squad endured a rapid decline over the last two months of the season, largely due to injuries, but as he’d say, it is what it is.

Belichick and Nick Caserio will take a long hard look at a roster that was built to win back-to-back Super Bowls but ultimately fell short of that goal, and they’ll have to determine if they need to make subtle changes or moves with a grander perspective.

Here are the 84 players they’ll study before mapping out an offseason plan.

QUARTERBACKS (2)

Tom Brady (signed through 2017): Brady was a legitimate MVP candidate for most of the season. His age still isn’t an issue.

Jimmy Garoppolo (signed through 2017): Without a first-round pick, this is the perfect offseason to gauge Garoppolo’s trade value, but they obviously won’t force it.

RUNNING BACKS (9)

Montee Ball (free agent): The Patriots didn’t sign Ball to a future contract, so he’s likely gone.

LeGarrette Blount (free agent): Blount, who didn’t need hip surgery after being placed on injured reserve, might be best-served to return on another incentive-laden deal. The Pats and Blount are good for each other.

Brandon Bolden (signed through 2016): A terrific special teamer with marginal offensive ability, Bolden is close to a lock to be on the 2016 roster.

James Develin (restricted free agent): The fullback broke his tibia in the preseason and was placed on IR. It’d be a surprise if he wasn’t back.

Tyler Gaffney (signed through 2017): Even before Gaffney hit IR for the second straight season, he didn’t stick out at camp, and expectations may be adjusted accordingly.

Joey Iosefa (signed through 2016): Iosefa was a cult hero for a day. He’ll be fun to watch this summer.

Steven Jackson (free agent): Jackson turns 33 in July and admitted he nearly retired already. His career might be over.

Dion Lewis (signed through 2017): Lewis was one of the league’s great stories before tearing his ACL in Week 9. His ability to bounce back will be a major focus in 2016.

James White (signed through 2017): White had 488 yards from scrimmage and six touchdowns during his last nine games in fulltime duty. He can build off that.

WIDE RECEIVERS (12)

Danny Amendola (signed through 2017): Amendola was indispensable this season, but he has a $6.87 million cap hit in 2016 and the Pats can save $4.13 million by cutting him. Would he be willing to restructure again?

Josh Boyce (exclusive rights free agent): The 2013 fourth-rounder was on injured reserve after a disappointing slide in training camp.

DeAndre Carter (signed through 2016): The practice squadder will be a long shot to make the team in camp.

Aaron Dobson (signed through 2016): Dobson was placed on IR with a bad high-ankle sprain. Injuries have sabotaged his career.

Julian Edelman (signed through 2017): The Patriots’ season hit a serious downturn when their No. 1 receiver broke his foot. Edelman proved to be one of the five or six most valuable players on the roster.

Brandon Gibson (free agent): Gibson tore his ACL in the preseason. He could aid the camp competition again if the recovery goes well.

Chris Harper (signed through 2016): The undrafted rookie had a flashy preseason but couldn’t get in sync with Brady and was a healthy scratch for both playoff games.

Brandon LaFell (signed through 2016): After a disappointing season, the Patriots could cut LaFell to save $3.8 million against the cap, but there’s no financial incentive to make that move before camp.

Keshawn Martin (signed through 2017): Martin earned a $600,000 signing bonus with his two-year extension this month, so the Pats believe he’ll make the team in 2016.

Matthew Slater (signed through 2016): The best special teamer in the league has a guaranteed roster spot for as long as he wants it.

Brian Tyms (restricted free agent): Tyms suffered a season-ending foot injury in August but could again add familiarity to the bottom of the depth chart if the Pats want him back.

J.J. Worton (free agent): The undrafted rookie was charged with three felonies for a weekend bar incident in Foxboro and conceivably may have a tough job finding another NFL job.

TIGHT ENDS (4)

Scott Chandler (signed through 2016): Chandler had his best two games against the Broncos and Eagles but didn’t catch a pass in his last five games. The Pats could save $2.05 million by parting ways.

A.J. Derby (signed through 2018): The sixth-rounder was placed on IR with a mysterious injury and never made an impression at practice.

Rob Gronkowski (signed through 2018): The Patriots already advanced $4 million of Gronk’s $10 million option, which is due in full by March 9. That will trigger the final four years of his contract.

Michael Williams (signed through 2016): Williams was a good guy and a decent blocker who did what they asked.

OFFENSIVE LINE (14)

David Andrews (signed through 2017): Andrews did a nice job in his 11 starts. He’ll absolutely get a chance to win a starting spot next year.

Chris Barker (signed through 2016): The practice squadder will be a depth piece and longshot to make the team.

Marcus Cannon (signed through 2016): Cannon allowed 2.5 sacks and five QB hits in the AFC title game. The Pats can save $3.75 million by cutting him.

Cameron Fleming (exclusive rights free agent): The 2014 fourth-rounder hasn’t panned out but would be an extremely cheap option to retain for camp competition.

Kevin Hughes (signed through 2016): Hughes was placed on IR in August and would be a longshot to make the team in 2016.

Tre’ Jackson (signed through 2018): Jackson looked good before succumbing to a nagging knee injury.

Josh Kline (signed through 2017): Kline was terrific, got a contract extension and then suffered a difficult shoulder injury that derailed his momentum for the rest of the season.

Shaq Mason (signed through 2018): Mason was the Pats’ best lineman against the Broncos and improved more than any lineman this season.

Keavon Milton (signed through 2016): The practice squadder will be a longshot to make the team.

Nate Solder (signed through 2017): Solder, who tore his biceps against the Cowboys, has a fully guaranteed $6 million base salary in 2016.

Bryan Stork (signed through 2017): Stork declined after a solid rookie season, perhaps due to injuries (concussion, neck, ankle) and committed a boneheaded head-butt last Sunday.

Sebastian Vollmer (signed through 2016): Vollmer’s $5.3 million cap hit in 2016 is easy to absorb, but the Pats could save $3.6 million by cutting him. With ankle issues, the soon-to-be 32-year-old’s status is intriguing.

LaAdrian Waddle (restricted free agent): Waddle wants to return and would be a nice candidate as their backup swing tackle.

Ryan Wendell (free agent): When Wendell was IR’d, it seemed like he played his last down for the Pats. But that shouldn’t be a sure thing with the way the season ended for his replacements.

DEFENSIVE LINE (14)

Alan Branch (signed through 2016): Really good and really cheap ($2.35 million cap hit in 2016). It makes sense to keep Branch, but they’ve got even younger, cheaper alternatives, so who knows.

Malcolm Brown (signed through 2018): Brown played like one of the draft’s first-round steals and a potentially longtime NFL starter.

Dominique Easley (signed through 2017): Easley impressed (2.0 sacks, eight QB hits, seven pressures, two run stuffs), and he could be an outstanding player if he ever stays healthy.

Trey Flowers (signed through 2018): Flowers was a healthy scratch a team-high 10 times before being placed on IR.

Geneo Grissom (signed through 2018): Grissom fell out of favor after blowing his assignment during the Eagles’ blocked punt, but he showed spots of potential.

Akiem Hicks (free agent): Hicks headlines the Pats’ list of free-agent decisions, which is a remarkable development after acquiring him from the Saints for Michael Hoomanawanui.

Rufus Johnson (exclusive rights free agent): Summer promise ended with a mysterious illness.

Chandler Jones (signed through 2016): Jones had a career-high 12.5 sacks. His $7.799 million cap hit in 2016 is the fifth highest on the team, so the Pats probably want to extend him to trim it. But how will his off-field “stupid mistake” impact his value?

Chris Jones (signed through 2016): Jones remained on the physically unable to perform list all season with a calf injury.

Ishmaa’ily Kitchen (signed through 2016): The December addition played one game for the Pats and will be a longshot to make the team.

Rob Ninkovich (signed through 2016): Ninkovich turns 32 next month but hasn’t shown his age yet. Pencil him in as a starter again next season.

Jabaal Sheard (signed through 2016): Sheard signed a two-year, $11 million deal last March as one of the league’s best offseason additions.

Sealver Siliga (restricted free agent): Slipped down the depth chart after two solid seasons, but he’d be an affordable piece to bring back for camp competition.

Joe Vellano (signed through 2016): A camp body and a longshot to make the roster.

LINEBACKERS (10)

Jon Bostic (signed through 2016): Maybe he will benefit from a full offseason in the program.

Jamie Collins (signed through 2016): One of the defense’s best players before his illness, Collins is a candidate for an extension. But with a $1.196 million cap hit in 2016, the Pats will free up space before getting that far. Otherwise, he could see a franchise tag in 2017.

Darius Fleming (signed through 2016): Will compete for a special teams job again next season.

Jonathan Freeny: (signed through 2016): The solid special teamer has a very good chance to make the team again in 2016.

Dane Fletcher (free agent): Remained on the PUP list in his return after tearing his ACL in the 2014 finale with the Bucs.

Dont’a Hightower (signed through 2016): With a $7.751 million cap hit in 2016, it’d be a surprise if the Pats’ most valuable defensive player didn’t get an extension soon.

Eric Martin (signed through 2016): A decent special teamer, he finished the season on IR.

Jerod Mayo (signed through 2017): The Pats would save $8 million by declining the option for the seven-time captain who had surgery Tuesday to repair a torn pectoral muscle.

Kevin Snyder (signed through 2016): Nice story for the undrafted rookie to make his NFL debut in the AFC title game.

Dekoda Watson (free agent): Served a special teams role during three stints this season.

CORNERBACKS (7)

Tarell Brown (free agent): Broke his foot and has discussed a return with the Pats for 2016.

Malcolm Butler (signed through 2016): The Pro Bowler was pretty solid in his first season as a starter, and there’s reason to like his long-term potential.

Justin Coleman (exclusive rights free agent): He played surprisingly well as the nickel corner when he was healthy. He’s one to watch this summer.

Leonard Johnson (signed through 2016): Did a good job for two games before tailing off late in the season.

Rashaan Melvin (signed through 2016): The practice squadder will be a longshot to make the team out of camp.

Darryl Roberts (signed through 2018): The seventh-rounder was a training camp sensation and started the first preseason game before a season-ending wrist injury.

Logan Ryan (signed through 2016): Ryan’s four-game dip toward the end of the season shouldn’t overshadow a fine season.

SAFETIES (9)

Patrick Chung (signed through 2017): He had a career year manning up tight ends and the occasional slot receiver.

Nate Ebner (free agent): It’d be a surprise if the Pats didn’t re-sign one of their three or four best special teamers.

Duron Harmon (signed through 2016): Don’t confuse Harmon as a sub-package player. He was on the field for the eighth most defensive snaps this season.

Brandon King (exclusive rights free agent): The rookie was awesome in kick coverage and a no-brainer to retain.

Devin McCourty (signed through 2019): He validated his five-year, $47.5 million contract with a terrific season in multiple roles.

Jordan Richards (signed through 2018): Had tough time seeing more snaps with McCourty, Chung and Harmon ahead of him on the depth chart.

Cedric Thompson (signed through 2016): The practice squadder will be a longshot to make the team in 2016.

Brock Vereen (signed through 2016): Shane’s little brother will be a longshot to make the team next season.

Tavon Wilson (free agent): A healthy scratch seven times, including both playoff games, he might seek another opportunity this offseason.

SPECIALISTS (3)

Ryan Allen (signed through 2018): No issues; he had another strong season.

Joe Cardona (signed through 2018): Cardona’s situation is always up in the air because of his Navy commitment, but he believes he’ll be allowed to play in 2016

Stephen Gostkowski (signed through 2018): The Pats believe they have the best kicker in the league, but it’s always important to see how they respond the season after a playoff mistake.