Team alongside teammate Tyler Morley for the second time. From the team, he received the Shawn Chambers Top Defenseman, Rick Pitta Most Dedicated Player, the Pump House Team Player Award, and the Fans' Choice Award, Professional At the completion of his junior season with the Nanooks, Parayko ended his collegiate career by signing a two-year, entry-level contract with the St. Louis Blues. He was subsequently reassigned to Blues' American Hockey League (AHL) affiliate, the Chicago Wolves, to finish the 2014–15 season on March 12, 2015. He made his AHL debut a few days later on March 15 and recorded a total of three goals and two assists over his first 11 professional games. Parayko ended the season with one more goal for a total of 7 points over 17 games. Upon concluding his AHL stint, Parayko stayed in the St. Louis area during the offseason to get ready for the Blues' 2015 training camp. As a result of his training and play, Parayko impressed at the Blues' training camp and made their opening night roster for the 2015–16 season. He earned praise from head coach Ken Hitchcock, who said "he's got poise with the puck and for a big man, he's got foot speed...He has great composure and he's getting better every day." In his third career NHL game on October 14, 2015, he recorded his first career NHL goals, including the game winner, in a 4–3 victory over the Calgary Flames. This resulted in him becoming the first Blues rookie defenseman to record a multi-goal performance since 2000–01. From there, Parayko continued to dominate on the ice and recorded five goals in his first 14 games, while continuing to work alongside the coaching staff. After games, he would review every video of his shift to critique and improve on his skating. Although Parayko spent the entirety of the season with the Blues, minor injuries would keep him out of the lineup for a few days. His first lower body injury came on November 16 during a game against the Winnipeg Jets, which kept him out for one game. His second injury occurred during a game against the New York Islanders on December 5. Parayko fell awkwardly on his right leg and was assisted to the Blues' dressing room, only to return three minutes later. He finished the game with 16:45 minutes of ice time and was not made available