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In addition to IFK Norrköping, 31 other teams played in SEF Trophy. They were divided into 8 different groups, whereof IFK Norrköping could be found in Group 7 together with Qviding FIF, Trelleborgs FF and AFC Eskilstuna. IFK Norrköping continued to Play off A after reaching 2:nd place in Group 7. In the playoff they made it to 1/4 Final, but lost it against IFK Göteborg with 0-1. In the Final, IF Brommapojkarna won over BK Häcken and became the winner of Play off A in SEF Trophy. IFK Norrköping also participated in SEF Trophy during Gothia Cup 2018. They reached the 1/8 Final in SEF Play off B, but lost it against Örebro SK with 1-3.