Career
He is currently in negotiations with English club Charlton athletic fc. Reports say Charlton"s owner has been following Siegfried for a while and would like to get his services at the valley for the forthcoming season which will are Charlton push for promotion out of the football league championship (D2)
Siegfried made his debut for Thun on 24 July 2011 in a 3–0 victory against Grasshopper Club Zürich.