Pre-draft Coming out of Ohio State, many analysts and scouts projected him as an early-to-mid first round draft selection. He was ranked the third best
outside linebacker (19th overall) by NFLDraftScout.com. He participated at the
NFL Combine and performed the majority of positional and combine drills except for the
40, 20, and 10 yard dash. Shazier also participated at Ohio State's
Pro Day and completed the combine drills he didn't perform at the NFL Combine. On scouting reports, scouts and analysts listed his best attributes as: athleticism, agility, production, flexibility, acceleration, strong hands, and lateral movement. Reports considered his flaws as his: lack of ideal size, under developed vision, instincts, anticipation, and lack of awareness. NFL.com media analyst
Daniel Jeremiah ranked him as the fourth best linebacker (25th overall) in the draft. Former NFL executive
Gil Brandt listed Shazier as the third best linebacker (19th overall) in the draft.
2014 The
Pittsburgh Steelers selected Shazier in the first round (15th overall) of the
2014 NFL draft. He was the third linebacker taken in the draft behind
Khalil Mack (5th overall) and
Anthony Barr (9th overall). On June 5, 2014, the Steelers signed Shazier to a fully guaranteed four-year, $9.50 million contract with a signing bonus of $5.23 million. Shazier began the season as the starting left inside linebacker. He made his professional regular season debut and first career start in the Steelers' home opener against the
Cleveland Browns. In his first career game, he made six total tackles (five solo) and a pass deflection. The following week against the
Baltimore Ravens, he had 15 total tackles, with 11 of them being solo, in a 6–20 loss. Shazier missed weeks 4–7 of his rookie season with a knee injury. He returned for his first game back from his injury on October 26, 2014, against the
Indianapolis Colts. He finished the game with four tackles (two solo tackles). After playing two games, Shazier then injured his ankle and missed another four games. After returning, Shazier made six combined tackles in a 27–17 victory over the
Cincinnati Bengals on December 24. Following an 11–5 season the Steelers made the playoffs. In his first career playoff game, Shazier made 3 solo tackles and one assist in a 17–30 wild-card loss to the Baltimore Ravens. In his first season, he finished with a total of 36 tackles, 24 solo tackles, and a pass deflection in five starts and eight games.
2015 After his rookie season, Shazier returned the next season to again be the starting inside linebacker. On September 10, 2015, Shazier made five solo tackles and two assists in the season opener at the
New England Patriots. The next game against the
San Francisco 49ers, he left the game with a shoulder injury in the fourth quarter after making a career-high 15 total tackles and 11 solo tackles. He also sacked 49ers quarterback
Colin Kaepernick for his first career sack. Shazier missed weeks 3–6 with nerve damage in his shoulder. After returning, he made five solo tackles, one assist, and a sack in a Week 10 win over the Cleveland Browns. On November 29, 2015, he sustained a concussion and left in the fourth quarter against the
Seattle Seahawks. On December 20, 2015, Shazier made three solo tackles, three assists, and three pass deflections in a 34–27 win over the
Denver Broncos. He also made his first career interception, after picking off Broncos quarterback
Brock Osweiler. On January 9, 2016, during the
AFC Wildcard game against the
Cincinnati Bengals, Shazier stripped the ball from
Jeremy Hill with 1:36 left in the fourth quarter. The ball was recovered by
Ross Cockrell, leading to the game-winning field goal from
Chris Boswell. Shazier finished the 18–16 victory with nine combined tackles and two forced fumbles. He finished the season with 87 combined tackles, 3 sacks, and an interception in 12 starts and 12 games.
2016 Shazier returned to his starting inside linebacker role to begin the 2016 season. He started the Steelers' season-opener against the
Washington Redskins and made six combined tackles, two pass deflections, a forced fumble, and intercepted
Kirk Cousins as the Steelers routed the Redskins 38–16. The next game, Shazier recorded a season-high 12 combined tackles in a 24–16 victory over the Bengals. He re-injured his knee the following game against the
Philadelphia Eagles and was inactive from Weeks 4–6. He made his return in a Week 7 matchup against the
New England Patriots and was limited to two assisted tackles and a pass deflection in the 27–16 loss. On December 25, 2016, he recorded ten combined tackles and intercepted
Joe Flacco in a 31–27 playoff clinching victory over the
Baltimore Ravens. The next game, Shazier made eight combined tackles and intercepted
Robert Griffin III in a 27–24 win over the Browns on their season finale. On January 15, 2017, he recorded 5 combined tackles and intercepted
Alex Smith in the Steelers' 18–16 Divisional Round victory over the
Kansas City Chiefs.
2017 On April 24, 2017, the Steelers picked up the fifth-year option on Shazier's contract. On September 10, 2017, he had one of the best statistical games of his career, tying a career-high with 11 solo tackles and forcing a career-high of two forced fumbles during a 21–18 victory over the Browns. On December 7, Shazier underwent spinal stabilization surgery to secure the injured section of spine and to aid in his recovery. The surgery ended his 2017 season. Despite the injury, Shazier was named to his second Pro Bowl on December 19, 2017. He was ranked 47th by his peers on the
NFL Top 100 Players of 2018. On February 28, 2018, Steelers GM
Kevin Colbert announced that Shazier would not be able to play during the 2018 season. On April 26, 2018, Shazier walked onto the
AT&T Stadium stage with his fiancée, Michelle Rodriguez, to announce the 28th pick of the
NFL draft,
Terrell Edmunds. On May 2, the Steelers placed Shazier on the reserve/PUP list, ending his 2018 season. On November 30, 2018, Shazier jogged for the first time since his spinal stabilization surgery, according to Steelers linebacker coach
Joey Porter. On April 29, 2019, the Steelers placed Shazier on the reserve/PUP list, ending his 2019 season. The Steelers placed Shazier on the reserve/retired list on March 17, 2020, effectively ending his playing career. On September 9, 2020, Shazier announced his retirement from the NFL. ==Coaching career==