The New England Patriots have sat atop the AFC East for nearly two decades with the duo of Tom Brady and Bill Belichick. However, that could be subject to change with Brady's impending free agency this offseason.

This past season, the Buffalo Bills took a step forward into becoming a contender in the division, having their first 10-win season since 1999. Now, Sean McDermott and company are focused on improving the roster even further this offseason.

The New York Jets are entering their second season with Adam Gase at the helm and could be an active team in free agency. On the other hand, the Miami Dolphins are slated to be arguably the most active team this offseason, with over $90 million in cap space and 14 draft picks.

Each team in the AFC East has a chance to better their rosters for the 2020 season in free agency and in the 2020 NFL Draft. With that being said, here is one player that each team in the AFC East needs to sign in NFL free agency.

Buffalo Bills — Robert Quinn

When the 2019 season came to a conclusion, Lorenzo Alexander announced his retirement from the NFL after 13 seasons; with his last four coming with the Bills. Besides Alexander's retirement, Buffalo also seems content with Shaq Lawson leaving in free agency.

Provided that, the Bills will have a void to fill off of the edge on the opposite side of Jerry Hughes. To help take the defense to the next level, Buffalo could benefit from signing Robert Quinn when free agency gets underway.

After being traded to the Dallas Cowboys in 2019, Quinn compiled 11.5 sacks and two forced fumbles. Quinn, who turns only 30 years old in May, could be a spectacular signing for the Bills to help aid their pass rush.

Miami Dolphins — Joe Thuney

The Dolphins are entering the offseason as the most loaded franchise in terms of cap space and draft capital. As previously mentioned, Miami possesses an excess of $90 million in cap space ahead of free agency.

With Brian Flores heading into his second season as head coach, this offseason will be a way for him to continue shaping the roster to his liking. Due to his connection with the Patriots, Flores could have Joe Thuney on his radar in free agency.

Since 2016, Thuney has been a fixture on New England's offensive line, starting in 64 consecutive games at left guard. Even though Thuney is expected to become one of the highest-paid guards in the NFL, the Dolphins have an ample amount of cap space to pay him.

Lastly, this year's draft class of interior offensive linemen isn't as deep as previous seasons. Therefore, signing Thuney to bolster the offensive front could be the best route for the Dolphins. Regardless of who is under center for Miami next season, strengthening the offensive line needs to be a priority this offseason.

New York Jets — Robby Anderson

Just two years ago, the Jets selected Sam Darnold with the third overall pick in the NFL Draft. Seeing that the team believes he is the franchise quarterback of the future, it's vital for New York to continue surrounding him with weapons.

At the same time, it's important to maintain continuity between him and his wide receivers. Given that, re-signing Robby Anderson should be on New York's list of things to do this offseason. While Anderson plans to test free agency, he's recently expressed a desire to remain with the Jets.

For the past four seasons, Anderson has been a phenomenal deep threat in the Jets aerial attack, averaging nearly 15 yards per reception in his career. Adam Gase and the Jets would be remiss to not try and sign Anderson to a long-term deal.

New England Patriots — Tom Brady

Of course, the most anticipated free-agency decision in the NFL is Brady. The future first-ballot Hall of Famer is going to be testing the open market for the first time in his illustrious career.

While returning to Foxborough remains a possibility, Brady will be courted by a handful of teams once free agency begins. It will be up to Bill Belichick and Robert Kraft to do everything they can to keep Brady with the Patriots until the end of his career.

Even though Brady is turning 43 years old by next season, he still gives New England the best chance of winning another Super Bowl — and vice versa. Rather than letting him sign elsewhere and begin rebuilding, the Patriots should be doing everything in their power to re-sign Brady.