On 10 January 2020, Czerwiński signed a three-year contract with Lech Poznań. The deal took effect after 2020–21 season.[2] Alan made his debut for Lech during round of 64 game of Polish Cup against Odra Opole on 15 August 2020.[3] During first months he helped Lech to reach UEFA Europa League group stage playing in all 4 qualification rounds.[4]
^Stankiewicz, Paweł (7 October 2020). "Title". Dziennik Bałtycki (in Polish). Dla Bochniewicza i Czerwińskiego to był również debiut w pierwszej reprezentacji ... [The friendly match also features the first national team debuts for [Paweł] Bochniewicz and [Alan] Czerwiński ...]
^"Sezon 2012/13". 90minut.pl (in Polish). Retrieved 22 February 2020.
^"Sezon 2013/14". 90minut.pl (in Polish). Retrieved 22 February 2020.
^"Sezon 2014/15". 90minut.pl (in Polish). Retrieved 22 February 2020.
^"Sezon 2015/16". 90minut.pl (in Polish). Retrieved 22 February 2020.
^"Sezon 2016/17". 90minut.pl (in Polish). Retrieved 22 February 2020.
^"Sezon 2017/18". 90minut.pl (in Polish). Retrieved 22 February 2020.
^"Sezon 2018/19". 90minut.pl (in Polish). 90minut. Retrieved 22 February 2020.
^"Sezon 2019/20". 90minut.pl (in Polish). Retrieved 22 February 2020.
^ ab"Sezon 2020/21". 90minut.pl (in Polish). Retrieved 14 October 2020.
^ ab"Sezon 2021/22". 90minut.pl (in Polish). Retrieved 2 September 2021.
^"Sezon 2022/23". 90minut.pl (in Polish). Retrieved 17 July 2022.