On January 5, 2017, it was announced that Shaheen would forgo his senior season and enter the 2017 NFL Draft. At the time of the announcement, he was ranked the 12th best tight end prospect in the draft by CBS Sports and NFLDraftScout.com.[7] Shaheen was one of 19 tight ends invited to the NFL Scouting Combine in Indianapolis, Indiana. He fared well in the combine drills and tied Oregon'sPharaoh Brown for first in the bench press with 24 reps.[8] Shaheen had his best performance during positional drills, showing his agility and receiving ability. He received a boost in his draft stock after he impressed scouts and team representatives with his performance in the positional drills.
The Chicago Bears selected Shaheen in the second round with the 45th overall pick in the 2017 NFL Draft.[20] The Bears originally owned the 36th overall pick in the second round, but opted to trade the selection with their seventh round pick (221st overall) to the Cardinals and acquired their second round (45th), fourth round (119th overall), and sixth round picks (197th overall).[21] Shaheen is the highest player to be selected from Ashland University. He joins Jeris Pendleton (2012), Bill Overmyer (1972), and Len Pettigrew (1971) as the only players to be drafted from Ashland.[22] On May 19, 2017, the Bears signed Shaheen to a four-year, $5.91 million contract with $3.17 million guaranteed and a signing bonus of $2.43 million.[23]
He made his professional regular season debut in the Bears' season-opening 23–17 loss to the Atlanta Falcons. On September 24, Shaheen made his first career start and caught the first pass of his career on a two-yard touchdown pass from quarterback Mike Glennon during their 23–17 overtime victory. His first career touchdown reception came in the second quarter as Shaheen was left wide open on a blown coverage by the Steelers.[26][27] Throughout the first seven regular season games, Shaheen was predominantly used as a blocking tight end in two and three tight end sets. During a Week 8 matchup against the Saints, starting tight end Zach Miller suffered a dislocated knee and tore his popliteal artery. Miller was placed on injured reserve for the remainder of the season and Shaheen became the second starting tight end, along with Dion Sims.[28] In Week 11, he made his third consecutive start and caught a season-high four passes for 41-yards and caught a one-yard touchdown pass from Mitchell Trubisky during the Bears' 27–24 loss to the Detroit Lions.[29] On December 10, Shaheen caught four passes for a season-high 44 receiving yards and scored on a one-yard touchdown reception during Chicago's 33–7 routing of the Cincinnati Bengals.[30] He injured his chest during the game and was inactive for the following week.[31]
2018
In 2018, Shaheen was slated to be the Bears starting tight end. However, in the team's second preseason game, Shaheen suffered a sprained ankle and foot. He was placed on injured reserve on September 2, 2018, with the possibility of returning later in the season.[32] He was activated off injured reserve on November 17, 2018.[33] Playing in six games, he recorded five catches for 48 yards and a touchdown.[34]
2019
Shaheen entered the 2019 season second on the Bears tight end depth chart behind Trey Burton. He was placed on injured reserve on November 30, 2019.[35] He finished the season with nine catches for 74 yards and no touchdowns.[36]
Miami Dolphins
On July 26, 2020, Shaheen was traded to the Miami Dolphins for a conditional seventh-round pick.[37] In Week 5 against the San Francisco 49ers, he recorded his first touchdown with the Dolphins in the 43–17 victory.[38]
On October 28, 2020, Shaheen signed a two-year, $7.65 million contract extension with the Dolphins.[39] He finished the 2020 season with 12 receptions for 150 receiving yards and three receiving touchdowns in 16 games and five starts.[40] In the 2021 season, Shaheen appeared in 12 games and started seven. He recorded 12 receptions for 110 receiving yards.[41]
On August 9, 2022, the Dolphins agreed to trade Shaheen along with a 2023 seventh-round pick to the Houston Texans in exchange for a 2023 sixth-round pick.[42] Two days later, the trade was cancelled due to Shaheen being unable to pass a physical.[43] The Dolphins placed him on injured reserve on August 16.[44]