Kammala jumla mai zuwa: A ranar 11 ga Fabrairun 2018, an zabe shi dan wasan Poland na shekara a karo na bakwai a jere. A ranar 22 ga Fabrairu, ya kori wakilin sa na dogon lokaci, Cezary Kucharski. Lewandowski ya ɗauki sanannen mai kulla yarjejeniya Pini Zahavi a matsayin sabon wakilin sa; an yi jita-jita cewa hayar Zahavi ita ce farkon Lewandowski da ke ƙoƙarin rufe ƙaura ta bazara zuwa Real Madrid. A ranar 24 ga Fabrairu, ya buga wasan sa na 250 a Bundesliga da Hertha BSC. A ranar 19 ga Mayu, Lewandowski ya ci Bayern kwallo daya tilo a wasan da suka ci 3-1.
DFB-Pokal na karshe da Eintracht Frankfurt.