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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	(1980-04-30) 30 April 1980 (age 44)	Ventspils
18	Steven Deana		GK	(1990-03-04) 4 March 1990 (age 34)	Vaduz
30	Mathieu Debonnaire		GK	(1987-04-26) 26 April 1987 (age 37)	FC Lausanne-Sport
Defenders
4	Milos Bakrac		CB	(1992-02-25) 25 February 1992 (age 32)	Trainee
5	André Marques		LB	(1987-08-01) 1 August 1987 (age 37)	Sporting CP
13	Mathieu Debons		LB	(1992-09-21) 21 September 1992 (age 32)	Trainee
17	Pa Modou Jagne		LB	(1989-12-26) 26 December 1989 (age 35)	FC St. Gallen
20	Vilmos Vanczák		RB	(1983-06-20) 20 June 1983 (age 41)	Újpest
22	Vincent Rüfli		RB	(1988-01-22) 22 January 1988 (age 37)	Servette FC
27	Léo Lacroix		CB	(1992-02-27) 27 February 1992 (age 32)	Trainee
28	Beg Ferati		CB	(1986-11-10) 10 November 1986 (age 38)	SC Freiburg
32	Arnaud Bühler		LB	(1985-01-17) 17 January 1985 (age 40)	SC Freiburg
Midfielders
2	Benjamin Kololli		MF	(1992-02-15) 15 February 1992 (age 32)	Trainee
6	Xavier Kouassi		MF	(1989-12-28) 28 December 1989 (age 35)	Servette FC
7	Demetris Christofi		MF	(1988-09-28) 28 September 1988 (age 36)	Omonia Nicosia
8	Vullnet Basha		MF	(1990-07-11) 11 July 1990 (age 34)	Neuchâtel Xamax
10	Ovidiu Herea		MF	(1985-03-26) 26 March 1985 (age 39)	Rapid București
14	Freddy Mveng		MF	(1992-05-29) 29 May 1992 (age 32)	BSC Young Boys
15	Ismael Yartey		MF	(1990-01-11) 11 January 1990 (age 35)	Loan From FC Sochaux
16	Matteo Fedele		MF	(1992-07-20) 20 July 1992 (age 32)	Trainee
23	Dario Vidosic		MF	(1987-04-08) 8 April 1987 (age 37)	Adelaide United FC
24	Max Veloso		MF	(1992-03-27) 27 March 1992 (age 32)	Neuchatel Xamax
34	Ndoye Birama		MF	(1994-04-17) 17 April 1994 (age 30)	Trainee
Forwards
9	Fousseyni Cissé		ST	(1989-07-17) 17 July 1989 (age 35)	Le Mans FC
11	Léo Itaperuna		ST	(1989-04-12) 12 April 1989 (age 35)	Arapongas
19	Gaetan Karlen		FW	(1993-07-06) 6 July 1993 (age 31)	Trainee
21	Ebenezer Assifuah		FW	(1993-07-03) 3 July 1993 (age 31)	Liberty Professionals F.C.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.

No. Pos. Nation Player 17 FW  SUI Danick Yerly (at Chiasso) 16 MF  SUI Joaquim Adao (at Chiasso) 4 DF  BRA Adaílton (at FC Chiasso) 18 GK  SUI Kevin Fickentscher (at FC Lausanne-Sport) 34 DF  SUI Anthony Sauthier (at Servette FC)

In: Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality. No. Pos. Nation Player 30 GK  SUI Mathieu Debonnaire (from FC Lausanne-Sport) 17 DF  GAM Pa Modou Jagne (from FC St.Gallen) 22 DF  SUI Vincent Rufli (from Servette FC) 28 DF  SUI Beg Ferati (from SC Freiburg) 31 DF  ARG Emiliano Dudar (from FC Chiasso) 6 MF  CIV Xavier Kouassi (from Servette FC) 10 MF  ROU Ovidiu Herea (from București) 14 MF  SUI Freddy Mveng (from BSC Young Boys) 15 MF  GHA Ishmael Yartey (from FC Sochaux) 7 FW  CYP Demitris Christofi (from Omonia Nicosia) 21 FW  GHA Ebenezer Assifuah (from Liberty Professionals F.C.) 23 MF  AUS Dario Vidosic (from Adelaide United FC)

Out: Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality. No. Pos. Nation Player 3 DF  BRA Aislan 6 MF  SUI Joaoquim Adao (on loan at Chiasso) 8 MF  ITA Gennaro Gattuso (Retired, Manager at Palermo) 9 FW  BRA Danilo ( Zorya Luhansk) 10 MF  TUN Ousamma Darragi (Espérance de Tunis) 11 FW  CMR Yannick N'Djeng (Espérance de Tunis) 12 FW  NIR Kyle Lafferty (US Palermo) 15 DF  NED Michael Dingsdag 16 MF  SUI Didier Crettenand (Servette) 17 FW  SUI Danick Yerly (on loan at Chiasso) 18 GK  SUI Kevin Fickentscher (on loan at Lausanne) 21 MF  FRA Karim Yoda 22 MF  SRB Dragan Mrdja 24 MF  SUI Xavier Margairaz 25 MF  SUI Evan Melo 32 MF  SUI Anthony Sauthier (Servette) 33 DF  BRA Adaílton (to Chiasso) 34 FW  SUI Aleksandar Prijovic ( Djurgården)