Giovanni-Guy Yann Sio (born 31 March 1989) is a professional footballer who plays as a forward.

[5] On 2 September 2009, Swiss club Sion signed the French forward from Real Sociedad.

[6] On 29 May 2011 Sio scored the first goal as Sion defeated Neuchâtel Xamax FCS 2-0 in the Swiss Cup Final.

In January 2012, he joined VfL Wolfsburg for a fee reported as €5 million, signing a four-year deal, keeping him until 2016.

The team also reached the final of the 2013–14 Swiss Cup, but were beaten 2–0 by Zürich after extra time.

Despite the fact that Basel won the championship later that season for the sixth time in a row[13] and 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,[14] 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.

He had his first call-up to the Ivory Coast national team in 2013, in a 2014 World Cup qualifying match against the Gambia.