After playing in three test games and in both Uhrencup matches, Voser played his domestic league debut for the club in the away game in the Stadion Wankdorf on 16 July 2011 as Basel played a 1–1 draw with Young Boys.
Voser's first appearance for his club occurred after participating in three practice games and two Uhrencup matches. The match took place at the Stadion Wankdorf on July 16, 2011, during a game between Basel and Young Boys.