There was much anticipation for the 2017–18 season after having the chance to win the title up until the final game the season before. However, any optimism of a repeat was short-lived. Lechia spent most of the season in the bottom half of the table and finished the regular season in 14th, one place and one point above the relegation zone. This was the first season Lechia had featured in the Relegation Round. Wins against Termalica Nieciecza, Arka Gdynia and Piast Gliwice ensured that Lechia finished the Relegation Round in 13th place, two places and three points above the relegation zone. Marco and Flávio had a huge contribution to Lechia staying up, with 16 goals from Marco and 10 for Flávio. At the end of the season Sebastian Mila retired from football, after having had two spells with Lechia.