He made his competitive debut on 12 August 2014 in the UEFA Super Cup at the Cardiff City Stadium, playing the full 90 minutes in a 2–0 defeat to Real Madrid. 11 days later, on 23 August 2014, Krychowiak made his La Liga debut for the club in a 1–1 draw against Valencia. Since making his debut for Sevilla, he quickly established himself in the starting eleven, playing in the midfield position. His performance earned praises from Marca, calling him the club's best signing this season. On 18 September 2014, Krychowiak scored his first goal for the club in a 2–0 win against Feyenoord in the UEFA Europa League group stage match. On 27 May 2015, he started for Sevilla in the 2015 UEFA Europa League Final in Poland's National Stadium in Warsaw, and scored the team's equalising goal in the 28th minute of an eventual 3–2 win over Dnipro, becoming the fifth Polish player to win the competition. He was the only Sevilla player named in the La Liga Team of the Season. Krychowiak made 48 appearances and scoring four times in all competitions.