Group A of the play-offs consisted of the teams finishing in positions 7, 9, 12 and 14 during the
regular season, and the first and third placed team in the qualifying positions in the
2017–18 Belgian First Division B. The teams finishing in positions 8, 10, 11, 13 and 15 joined the second placed qualifier from the 2017–18 Belgian First Division B in group B.
Group A Group B Semi-final The winners of both play-off groups competed in one match to play the fourth-placed or fifth-placed team of the championship play-offs for a spot in the final.
Zulte Waregem received home advantage as they finished higher in the regular season. Despite going down twice with 10 men, Zulte Waregem won, which meant they advanced to the final to play for a spot in the
second qualifying round of the 2018–19 UEFA Europa League.
Final The winners of the Europa League play-off semi-final and the fifth-placed team of the championship play-offs played one match to determine the Europa League play-off winners. The winners qualified for the
second qualifying round of the 2018–19 UEFA Europa League. == Number of teams by provinces ==