Sio with Rennes in 2015
|Full name||Giovanni-Guy Yann Sio|
|Date of birth||31 March 1989|
|Place of birth||Saint-Sébastien-sur-Loire, France|
|Height||1.80 m (5 ft 11 in)|
|2007–2009||Real Sociedad B||37||(0)|
|2012–2013||→ Augsburg (loan)||6||(0)|
|2013||→ Sochaux (loan)||13||(4)|
|2015||→ Bastia (loan)||13||(5)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 25 February 2017.
‡ National team caps and goals correct as of 8 January 2017
Sio began his career with Nantes and joined in summer 2007 to Real Sociedad B after Nantes released him. He was promoted in summer 2008 to the Segunda División team. Sio signed a two-year deal with an option for a third year.
In January 2012 he joined VfL Wolfsburg for a fee reported as 5 million euros signing a four-year deal keeping him until 2016. He was sent to Augsburg on 10 July 2012 on loan until the end of the 2012–13 campaign. The loan was ended prematurely on 31 January 2013.
On 16 August 2013 it was announced that Sio had joined Basel on a four-year contract. At the end of the 2013–14 Super League season he won the league championship with Basel. They also reached the final of the 2013–14 Swiss Cup, but were beaten 2–0 by Zürich after extra time. During the 2013–14 Champions League season Basel reached the group stage and finished the group in third position. Thus they qualified for Europa League knockout phase and here they advanced as far as the quarter-finals.
The season 2014–15 was also a successful one for Basel, but for Sio it was a difficult one under the new trainer Paulo Sousa. Despite the fact that Basel won the championship later that season for the sixth time in a row  and despite the fact that Basel had entered the Champions League in the group stage reaching the knockout phase on 9 December 2014 as they managed a 1-1 draw at Anfield against Liverpool, Sio totaled just 16 appearances during the first half of the season, 7 (of 18) League, 2 (of 3) in the Cup and just 1 (of 6) in the Champions League, as well 6 further appearances in test games. Because Sousa did not rely upon Sio, during February 2015, Sio was loaned out to Ligue 1 team SC Bastia until the end of the season.
Sio was born in Ivory Coast to Ivorian parents, but was raised in France. Sio is also former member of the France national youth football team, he represented his country at U-15, U-16 and U-17. Sio was also called up to the Ivory Coast U-20 squad for the 2010 Toulon Tournament. Sio was first called up to the Ivory Coast national football team in 2013 in a 2014 World Cup qualifying match against the Gambia.
- Scores and results list Ivory Coast's goal tally first.
|1.||17 November 2015||Stade Félix Houphouët-Boigny, Abidjan, Ivory Coast||Liberia||1–0||3–0||2018 FIFA World Cup qualification|
|3.||8 January 2017||Zayed Sports City Stadium, Abu Dhabi, United Arab Emirates||Sweden||2–1||2–1||Friendly|
- Weitere Wechsel beim FC Sion
- Football : Giovanni Sio à la Real Sociedad : c'est fait !
- Ein Paraguayer und ein Franzose stossen zu den Wallisern
- Wallis: Rober Antonio Servìn und Giovanni Sio neu beim FC Sitten
- "Wolfsburg sign strike pair Vieirinha and Sio". Sport.co.uk. 4 January 2012. Retrieved 29 August 2012.
- Giovanni Sio verstärkt den FCA
- "Basel holt Giovanni Sio als Ersatz für Raul Bobadilla". Aargauer Zeitung. 16 August 2013. Retrieved 19 August 2013.
- Grossenbacher, Sacha (2014). "Fotos vom Spiel gegen Lausanne sowie den anschliessenden Feierlichkeiten" (in German). FC Basel 1893. Retrieved 2014-05-18.
- Marti, Caspar (2015). "Der Meisterfreitag im bunten Zeitraffer". FC Basel 1893. Retrieved 2015-05-29. (German)
- "Liverpool 1 Basel 1". BBC Sport. 10 December 2014. Retrieved 10 December 2014.
- Zindel, Josef (2015). Rotblau: Jahrbuch Saison 2015/2016. FC Basel Marketing AG. ISBN 978-3-7245-2050-4.
- "Giovanni Sio prêté 6 mois" (in French). sc-bastia.net. 2 February 2015. Retrieved 2 February 2015.
- Transfer-Wirbel beim FC Sion
- "Sio, Giovanni". National Football Teams. Retrieved 15 February 2017.