Long was selected by the Washington Redskins in the third round, 78th overall, of the 2014 NFL draft.[3][4] On May 16, 2014, Long signed his four-year rookie contract, worth US$2.85 million.[5]
With the release of former starting right guard, Chris Chester, Long was given the chance to compete for the starting position. He ended up losing out to Brandon Scherff, who originally was expected to become the starting right tackle.[6] He would then become the starting left guard after regular starter, Shawn Lauvao, was placed on the team's injured reserve in September 2015.[7] In 2016, Long became the team's starting center after a season-ending injury to Kory Lichtensteiger in week 3.[8] On November 21, 2017, Long was placed on injured reserve after dealing with knee tendinitis.[9]
New York Jets
On March 18, 2018, Long signed a four-year, $28 million contract with the New York Jets.[10][11] He started 13 games in 2018 at center and left guard but was released on February 5, 2019.[12]
Buffalo Bills
On February 12, 2019, Long signed a three-year $12.6 million contract with the Buffalo Bills.[13] On March 10, 2020, Long's second-year option was exercised by the Bills. He was released on August 4, 2020.[14]
