Lechia went into the 2020–21 celebrating their 75th anniversary, but with the fans and team knowing they had lost some key players from previous seasons. Filip Mladenović joined rivals Legia Warsaw while Lukáš Haraslín made the permanent move to U.S. Sassuolo. Lechia struggled at the start of the season, losing two of their first three games, before finding some form and moving to a high of 4th place. The effects of the coronavirus were again felt by the team, with the match against Wisła Kraków being postponed due to an outbreak in the Wisła team. Lechia eventually struggled with a Covid outbreak of their own, with Jaroslav Mihalík being the first confirmed case in the club on 10th October, getting the virus while on international duty. In early November the club had an outbreak affecting 13 players and 7 members of the coaching staff. After a month with no games due to the teams outbreak the Lechia team returned to play Śląsk Wrocław, winning the game 3–2. After this initial success after the teams isolation, Lechia lost the following four games without scoring a goal. Going into the final game before the winter break the team found themselves in the bottom half of the table. A 3–0 win over Cracovia helped them to rise up to 8th.