Legia Warszawa SA was one of four clubs from Poland that had teams playing during Gothia Cup 2018. They participated with one team in Gothia Trophy (B17). In addition to Legia Warszawa SA, 35 other teams from 12 different countries played in Gothia Trophy (B17). They were divided into 6 different groups, whereof Legia Warszawa SA could be found in Group 1 together with AIK FF, IFK Norrköping and ASEC. Legia Warszawa SA continued to Play off B after reaching 3:rd place in Group 1. In the playoff they made it to 1/8 Final, but lost it against Hammarby IF FF with 2-3. In the Final, TikiTaka Academy won over FC Cavalier and became the winner of Play off B in Gothia Trophy (B17).