He is now a football agent and represented Timm Klose during his transfer to Giallanza's old club Norwich City.
[1] Giallanza played youth football with Old Boys and joined OB's first team for their 1991–92 in their Nationalliga B season.
Giallanza played the following season with Sion, but could not maintain a place in the starting eleven and so moved on again.
[2] He played his domestic league debut with the team in the away game two weeks later on 10 July 1996 as Basel won 1–0 against Aarau.
[5] Giallanza signed for Nantes and played his league debut for them on 26 September 1997 and scored his first goal for them in the same game.
An injury in the home match on 20 October 2000 against Sheffield United forced Giallanza out for the remainder of the season and the entire following year.
Giallanza worked two years alongside former professional footballer David Hodgson for BHP sports management and representation.