In the 2012–13 season, Sion competes in the Swiss Super League and the Swiss Cup. In the summer transfer window, they brought in Italian World Cup winner Gennaro Gattuso, as well as Kyle Lafferty (former of Rangers). In addition, they bought an until then unknown Brazilian footballer called Léo Itaperuna from the 5th division Club of Arapongas and another forward Mathieu Manset from Reading. Already signed six months earlier, Oussama Darragi coming from Esperance de Tunis joined the team along with André Marques from Sporting Lisabon.

The 2012–13 season began well with Sion staying at the top till the 8th round. Fournier played with a 4-2-3-1 system.

On 4 September 2012, Manset, Joaquim Adão and Darragi were all disciplined after being found in the early hours of the morning in a Lausanne nightclub the day before Sion's game away to FC Zürich. Manset's contract with the club was canceled, Adão was demoted to the youth team for one month and Darragi was handed a large fine. This huge upset resulted in the resignation of Sebastien Fournier as coach.

...
Wikipedia