[1] During the winter break of the 2000–01 season, FC Basel bought Tum out of his contract for a reported two million Swiss Francs.

Basel were able to play their home games of the championship group in their new stadium, the St. Jakob-Park which opened on 15 March 2001 and it was sold out with 33,433 spectators on three occasions.

[2] He played his domestic league debut for his new club in the away game in the Charmilles Stadium on 25 February as Basel were defeated 3–0 by Servette.

After suffering three more away defeats against Zürich, Xamax and Grasshopper Club the team then found themselves, winning nine of the next eleven games.

Basel started well into the second part of the season and during this period FCB played their best football, pulling away at the top of the table and subsequently achieved the championship title prematurely.

Basel won the last game of the season, on 8 May 2002, and became champions ten points clear at the top of the table.

Just four days later they played in the cup final against Grasshopper Club winning 2–1 after extra time, Tum scored his sides first goal.

They ended this in second position behind Valencia, but ahead of Liverpool and Spartak Moscow to advance to the second group stage.

Basel won the championship with 26 victories and seven draws, the team had suffered just three away defeats, and obtained 85 points.

[11] Tum joined FC Metz on a free transfer for their 2004–05 season, immediately becoming a regular starter.