ˈæftɚ plˈeɪɪŋ ɪn wˈʌn tˈɛst mˈætʃ, nˈʌp plˈeɪd hɪz dəmˈɛstɪk lˈiːɡ deɪbjˈuː fɚðə klˈʌb ɪnðə hˈoʊm ɡˈeɪm æt ðə sənt. jˈækɑːb stˈeɪdiəm ˌɔn nˈaɪntiːn ˈeɪpɹəl nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi sˈɪks æz bˈɑːzəl wˈʌn fˈaɪv zˈiəɹoʊ ɐɡˈɛnst bˈædən.
After playing in one test match, Knup played his domestic league debut for the club in the home game at the St. Jakob Stadium on 19 April 1986 as Basel won 5–0 against Baden.