Gelson da Conceição Tavares Fernandes (born 2 September 1986) is a Swiss professional footballer who plays as a defensive midfielder for German club Eintracht Frankfurt. He also plays for the Switzerland national team.
Fernandes started his football career at FC Sion and was promoted to the first team in 2004 after being called by manager Gilbert Gress. The 2005–06 season proved to be the breakout year for Fernandes as he got more playing time for Sion. He played in central midfielder position for Sion. On 23 July 2005, Fernandes made his professional league debut for Sion in a 2–1 loss against Lausanne. In his first season, Fernandes made 22 league appearance and scoring none. In the 2006–07 season, Fernandes was able to get more playing time when he made 35 league appearances for Sion. In the first round of the UEFA Cup, Fernandes made his European Cup debut for Sion in a 0–0 draw against Bayer Leverkusen and in the second round of UEFA Cup, Fernandes scored his first professional league goal and first European Cup goal against Leverkusen which Sion lost 3–1 on aggregate. On 14 October 2006, Fernandes scored his first league goal for Sion in a 1–1 draw against Luzern. Fernandes also led his team win the Swiss Cup in a penalty shootout (5–3) against Young Boys. In the final game of the league 2006–07 season, Fernandes received a second bookable offense on a 90th minutes after receiving a yellow card in a first half which turns out to be Fernandes last appearance for Sion as Sion won 3–0 against St. Gallen.