mˈiːlə pɹəɡɹˈɛst ˌɪntʊ ðə lˈɛkiə dʒˈiːdˈænsk fˈɜːst tˈiːm dˈʊɹɹɪŋ ðə nˈaɪntiːnhˈʌndɹɪd nˈaɪnti nˈaɪn tˈuː θˈaʊzənd sˈiːzən, mˌeɪkɪŋ hɪz pɹəfˈɛʃənəl deɪbjˈuː ɐɡˈɛnst swˈɪt nˈoʊi dwˈɜː mˈæzoʊˌaɪki ɪn mˈɑːɹtʃ tˈuː θˈaʊzənd.
Mila progressed into the Lechia Gdańsk first team during the 1999–2000 season, making his professional debut against Świt Nowy Dwór Mazowiecki in March 2000.