On 8 March 2002, Boruc played his first league match for Legia when he came on as a substitute during a 2–2 draw against Pogoń Szczecin. This unexpected debut was due to an injury sustained by Bulgarian goalkeeper, Radostin Stanev, during the game. Boruc played in Legia's next four league matches and kept clean sheets against Wisła Kraków and Odra Wodzisław, although Stanev regained his place in the side upon his return from injury for the remaining league and cup fixtures. Legia went on to win the Ekstraklasa title that season for the first time in seven years.