Nadig played his youth football with local team Basel. He advanced to their first team for their 1983–84 season and signed his first professional contract under manager Ernst-August Künnecke. After playing in 12 test games, Nadig played his domestic league debut for the club in the home game in the St. Jakob Stadium on 11 March 1984 as Basel played a 1–1 draw with Sion. He collected his first yellow card in the same game.[1] He scored his first goal for his club in the home game on 28 April and it was the last goal of the game in the 22nd minute as Basel won 3–0 against Zürich.[2]
Following the relegation he left the team. Between the years 1983 and 1988 Nadig played a total of 197 games for Basel scoring a total of 78 goals. 123 of these games were in the Nationalliga A, nine in the Swiss Cup and 65 were friendly games. He scored 41 goals in the domestic league, six in the cup and the other31 were scored during the test games.
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Nadig transferred to Luzern where he played for seven years. He won the championship with Luzern in the 1988–89 season and the Swiss Cup in 1991–92 as Luzern won 3–1 after extra time. Nadig achieved his greatest personal success in 1989 as he was voted Swiss Footballer of the Year.[5]
^Müller, Lukas (2010). "Rotblau: Peter Bernauer - Zuverlässig und kopfballstark im Abwehrzentrum". Rotblau (in German). FC Basel Marketing AG. ISSN1660-0878.
^Verein "Basler Fussballarchiv”. "Peter Nadig - FCB-Statistik". Verein "Basler Fussballarchiv”. Retrieved 16 November 2019.