Ultimately, on August 16, 2019, the NFL conditionally reinstated Gordon, thus granting him the opportunity to play Week 1. During Week 1 against the Pittsburgh Steelers, in his first game since Week 13 of the 2018 season, Gordon had three receptions for 73 yards and one touchdown in a 33–3 win. On October 23, 2019, the Patriots placed Gordon on injured reserve with a knee injury. He was waived from injured reserve on October 31, 2019. On November 1, 2019, Gordon was claimed off waivers by the Seattle Seahawks. In Week 15 against the Carolina Panthers, Gordon caught one pass for 58 yards and threw a pass that was intercepted by safety Tre Boston during the 30–24 win. On December 16, 2019, Gordon was suspended indefinitely for violating the NFL's policy on performance-enhancing drugs and substance abuse, his fifth suspension for violating the policy.