wˌɛn ɐn ˈɪndʒɚɹi tʊ ˈeɪ. dʒˈeɪ. bˈɜːnɪt kɹiːˈeɪɾᵻd ɐn ˈoʊpənɪŋ ɪnðə blˈuː dʒˈeɪz ɹoʊtˈeɪʃən, dʒˈænsən wʌz pɹəmˈoʊɾᵻd fɹʌm sˈɪɹɐkjˌuːs ænd mˌeɪd hɪz mˈeɪdʒɚlˈiːɡ deɪbjˈuː ɐɡˈɛnst ðə bˈɔltɪmˌoːɹ ˈoːɹɪˌoʊlz ˌɔn ˈeɪpɹəl twˈɛnti sˈɛvən, tˈuː θˈaʊzənd sˈɪks.
When an injury to A. J. Burnett created an opening in the Blue Jays' rotation, Janssen was promoted from Syracuse and made his major-league debut against the Baltimore Orioles on April 27, 2006.