| Club: | Sion |
| Season: | 2013–14 |
| Manager: | Laurent Roussey 23 October 2013 - |
| Chairman: | Christian Constantin |
| Stadium: | Stade Tourbillon |
| League: | Swiss Super League |
| League Result: | 8th |
| Cup1: | Swiss Cup |
| Cup1 Result: | 3rd round |
| Prevseason: | 2012–13 |
| Nextseason: | 2014–15 |
In the 2013–14 season, Sion competed in the Swiss Super League and the Swiss Cup. In the summer transfer window 2013, the Chairman promoted 7 U21 players to the 1st Team. To bring stability and experience in they bought Vincent Rüfli and Xavier Kouassi from Servette FC, Pa Modou Jagne replacing Arnaud Bühler, twenty-one-year-old Freddy Mveng, Demitris Christofi as a winger and Ismael Yartey on loan as well as Beg Ferati and Ovidiu Herea.
The 2013–14 season began rather poorly with Sion not scoring a goal until the 7th round and setting a new record in the Swiss Super League for the lowest scoring season start. Decastel played with a 4-2-3-1 system.
| No. | Name | Nationality | Position | Date of birth (Age) | Signed from | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Goalkeepers | ||||||||||
| 1 | Andris Vanins | GK | 1980 4, df=yes | Ventspils | ||||||
| 18 | Steven Deana | GK | 1990 3, df=yes | Vaduz | ||||||
| 30 | Mathieu Debonnaire | GK | 1987 4, df=yes | FC Lausanne-Sport | ||||||
| Defenders | ||||||||||
| 4 | Milos Bakrac |  | CB | 1992 2, df=yes | Trainee | |||||
| 5 | André Marques | LB | 1987 8, df=yes | Sporting CP | ||||||
| 13 | Mathieu Debons | LB | 1992 9, df=yes | Trainee | ||||||
| 17 | Pa Modou Jagne | LB | 1989 12, df=yes | FC St. Gallen | ||||||
| 20 | Vilmos Vanczák |  | RB | 1983 6, df=yes | Újpest | |||||
| 22 | Vincent Rüfli | RB | 1988 1, df=yes | Servette FC | ||||||
| 27 | Léo Lacroix | CB | 1992 2, df=yes | Trainee | ||||||
| 28 | Beg Ferati | CB | 1986 11, df=yes | SC Freiburg | ||||||
| 32 | Arnaud Bühler | LB | 1985 1, df=yes | SC Freiburg | ||||||
| Midfielders | ||||||||||
| 2 | Benjamin Kololli | MF | 1992 2, df=yes | Trainee | ||||||
| 6 | Xavier Kouassi |  | MF | 1989 12, df=yes | Servette FC | |||||
| 7 | Demetris Christofi |  | MF | 1988 9, df=yes | Omonia Nicosia | |||||
| 8 | Vullnet Basha |  | MF | 1990 7, df=yes | Neuchâtel Xamax | |||||
| 10 | Ovidiu Herea | MF | 1985 3, df=yes | Rapid București | ||||||
| 14 | Freddy Mveng | MF | 1992 5, df=yes | BSC Young Boys | ||||||
| 15 | Ismael Yartey |  | MF | 1990 1, df=yes | Loan From FC Sochaux | |||||
| 16 | Matteo Fedele | MF | 1992 7, df=yes | Trainee | ||||||
| 23 | Dario Vidosic |  | MF | 1987 4, df=yes | Adelaide United FC | |||||
| 24 | Max Veloso | MF | 1992 3, df=yes | Neuchatel Xamax | ||||||
| 34 | Ndoye Birama |  | MF | 1994 4, df=yes | Trainee | |||||
| Forwards | ||||||||||
| 9 | Fousseyni Cissé |  | ST | 1989 7, df=yes | Le Mans FC | |||||
| 11 | Léo Itaperuna |  | ST | 1989 4, df=yes | Arapongas | |||||
| 17 | Danick Yerly | ST | 1985 11, df=yes | ---> | ||||||
| 19 | Gaetan Karlen | FW | 1993 7, df=yes | Trainee | ||||||
| 21 | Ebenezer Assifuah | | FW | 1993 7, df=yes | Liberty Professionals F.C. | |||||
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