|Full name||Antônio Naelson Matias|
|Date of birth||May 23, 1976|
|Place of birth||Itajá, Rio Grande do Norte, Brazil|
|Height||1.63 m (5 ft 4 in)|
|Playing position||Attacking Midfielder|
|2014–2016||→ Querétaro (loan)||48||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 18 September 2016.
A creative attacking midfielder, Naelson is known for his vision, pace, dribbling and passing ability. He is also an accurate set-piece taker.
Sinha measures 163 cm (5 ft 4 in) and weighs 67 kg (147 lb).
Sinha arrived in 1998 to Mexico, when he joined CF Monterrey. On 1999, he moved to Toluca. Sinha is widely known for his dribbling skills, his accurate passing and his intelligence on the pitch as well as his leadership and long distance shot.
On February 12, 2017, Sinha achieved 600 official caps(including cup matches) with Toluca. This coincided with Toluca's 100 year anniversary. 
He has also been called up to play for Mexico, although he is a Brazilian-born player, he became a naturalized Mexican citizen, after settling in Mexico for several years. During the 2006 FIFA World Cup in Germany, Sinha became the first foreign-born player to score a goal for Mexico in a World Cup tournament, scoring against Iran. He was called up to play again for Mexico, thus making him the first naturalized to be called up by Hugo Sánchez.
In 2005, he played in the Confederations Cup scoring a goal against Japan that helped Mexico win the match. Mexico finished in fourth place in the tournament. He was also called up for the national team to play in the Gold Cup.
During the 2011 CONCACAF Gold Cup, Sinha, and four other members of the Mexico national team tested positive for the banned substance of Clenbuterol and were removed from the team's tournament squad. However, all players were exonerated as FIFA determined that the accused had accidentally ingested the banned substance through contaminated meat that had been served during a pre-tournament training camp.
His final competitive match would come during a difficult time for the Mexico national team, as they barely qualified for the World Cup playoff against New Zealand. Miguel Herrera found it necessary to only call up Liga MX players thus including the veteran Sinha on his roster. Sinha would sub in during both legs of the play-offs as Mexico successfully advanced to the 2014 FIFA World Cup.
- Primera División de México (5): Verano 2000, Apertura 2002, Apertura 2005, Apertura 2008, Bicentenario 2010,
- CONCACAF Champions Cup: 2003
- Mexican Supercup (Campeón de Campeones): 2003, 2006
- Best attacking midfielder of the tournament: Bicentenario 2010
- Best player of the tournament: Bicentenario 2010
- Best goal of FIFA Confederations Cup history:
- Scores and results list Mexico's goal tally first.
|1.||October 13, 2004||Estadio Cuauhtémoc, Puebla, Mexico||Trinidad and Tobago||1–0||3–0||2006 FIFA World Cup qualification|
|2.||March 27, 2005||Estadio Azteca, Mexico City, Mexico||United States||2–0||2–1||2006 FIFA World Cup qualification|
|3.||June 4, 2005||Estadio Mateo Flores, Guatemala City, Guatemala||Guatemala||1–0||2–0||2006 FIFA World Cup qualification|
|4.||June 16, 2005||AWD-Arena, Hanover, Germany||Japan||1–1||2–1||2005 FIFA Confederations Cup|
|5.||June 11, 2006||Frankenstadion, Nuremberg, Germany||Iran||3–1||3–1||2006 FIFA World Cup|
|6.||June 4, 2008||Qualcomm Stadium, San Diego, United States||Argentina||1–3||1–4||Friendly|
- "FIFA Player Statistics: Sinha". FIFA.com. Retrieved 15 November 2013.
- "Five Mexico Players Test Positive". ESPN Soccernet. June 9, 2011.
- "FMF absolvió a acusados de dopaje". ESPNDeportes Mexico. July 10, 2011.
- "FOOTBALL – THE CAS DISMISSES URGENT REQUEST FOR A STAY FILED BY OLYMPIAKOS VOLOU". The Court of Arbitration for Sport. 17 August 2011. Retrieved 18 August 2011.
- "WADA withdraws CAS appeal in case of Mexican footballers". World Anti-Doping Agency. 12 October 2011. Retrieved 23 October 2011.
- "Zinha: A goal to remember". FIFA.com. 14 June 2013. Retrieved 21 November 2013.