Blue / Black /
In addition to IK Sirius FK, 31 other teams played in SEF Trophy. They were divided into 8 different groups, whereof IK Sirius FK could be found in Group 2 together with Varbergs BoIS FC, Jönköpings Södra IF and AIK FF. IK Sirius FK continued to Play off B after reaching 3:rd place in Group 2. In the playoff they made it to Semi final, but lost it against IFK Värnamo with 2-4. In the Final, IFK Värnamo won over Örgryte IS and became the winner of Play off B in SEF Trophy. IK Sirius FK also participated in SEF Trophy during Gothia Cup 2018. They reached the 1/4 Final in SEF Play off B, but lost it against Trelleborgs FF with 0-2.