Soccer Football - Champions League - Valencia Training - Sports City of Paterna, Valencia, Spain - March 9, 2020 Valencia's Jasper Cillessen and Cristian Rivero Sabater arrive as Valencia train behind closed doors as the number of coronavirus cases grow around the world REUTERS/Susana Vera 

Soccer Football - Champions League - Group H - Ajax Amsterdam v Valencia - Johan Cruijff Arena, Amsterdam, Netherlands - December 10, 2019 Valencia's Cristian Rivero during the warm up before the match REUTERS/Piroschka van de Wouw 

Soccer - Copa Libertadores - Group Stage - Group H - Gremio v Libertad - Arena do Gremio, Porto Alegre, Brazil - March 12, 2019 Gremio's Diego Tardelli in action with Libertad's Cristian Riveros REUTERS/Diego Vara 

Soccer Football - Copa Libertadores - Paraguay's Libertad v Argentina's Boca Juniors - Defensores del Chaco, Asuncion, Paraguay - August 30, 2018 Boca Juniors Mauro Zarate (L) in action with Libertad's Cristian Riveros. REUTERS/Cesar Olmedo 

Soccer Football - Argentina's Boca Juniors v Paraguay's Libertad - Copa Libertadores - Alberto J. Armando stadium, Buenos Aires, Argentina - August 8, 2018 - Boca Juniors' Paolo Goltz and Mauro Zarate and Libertad's Paulo Da Silva and Cristian Riveros wait for a free kick. REUTERS/Javier Garcia Martino 

Soccer Football - Paraguay's Libertad v Argentina's Atletico Tucuman - Copa Libertadores - Nicolas Leoz Stadium, Asuncion, Paraguay - May 17, 2018 - Luis Rodriguez (R) of Atletico Tucuman's and Libertad's Cristian Riveros (top) in action. REUTERS/Jorge Adorno 

Soccer Football - Paraguay's Libertad v Argentina's Atletico Tucuman - Copa Libertadores - Nicolas Leoz Stadium, Asuncion, Paraguay - May 17, 2018 - Nery Leyes (C) of Atletico Tucuman's and Libertad's Cristian Riveros in action. REUTERS/Jorge Adorno 

Soccer Football - 2018 World Cup Qualifications - South America - Paraguay Training - Barranquilla, Colombia - October 4, 2017 Paraguay's Cristian Riveros in action during a training session ahead of their match against Colombia. REUTERS/Jaime Saldarriaga 

Soccer Football - 2018 World Cup Qualifiers - Paraguay v Uruguay - Defensores del Chaco stadium, Asuncion, Paraguay - September 5, 2017. Paraguay's Cristian Riveros (R) and Uruguay's Federico Valverde (C) in action. REUTERS/Mario Valdez 

Football Soccer - Brazil v Paraguay - World Cup 2018 Qualifiers - Arena Corinthians stadium, Sao Paulo, Brazil - 28/3/17 - Paraguay's goalkeeper Antony Silva and his teammate Cristian Riveros (R) argue with referee Victor Corrillo from Peru. REUTERS/Paulo Whitaker 

Football Soccer - Brazil v Paraguay - World Cup 2018 Qualifiers - Arena Corinthians stadium, Sao Paulo, Brazil - 28/3/17 - Paraguay's goalkeeper Antony Silva (C) and his teammate Cristian Riveros (R) argue referee Víctor Carrillo. REUTERS/Paulo Whitaker 

Football Soccer - Brazil v Paraguay - World Cup 2018 Qualifiers - Arena Corinthians stadium, Sao Paulo, Brazil - 28/3/17 - Brazil's Paulinho (15) and Paraguay's Cristian Riveros in action. REUTERS/Paulo Whitaker 

Football Soccer - Brazil v Paraguay - World Cup 2018 Qualifiers - Arena Corinthians stadium, Sao Paulo, Brazil - 28/3/17 - Brazil's Paulinho (15) and Paraguay's Cristian Riveros in action. REUTERS/Paulo Whitaker 

Football Soccer - Paraguay's national team training - World Cup 2018 Qualifier - Ypane, Paraguay - 26/03/17. Paraguay's national soccer team Cristian Riveros (C) attends a training session with teammates. REUTERS/Jorge Adorno 

Football Soccer - Paraguay v Ecuador- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay- 23/03/17 - Felipe Caicedo (C) of Ecuador's fights for the ball with Cristian Riveros (L) of Paraguay. REUTERS/Jorge Adorno 

Football Soccer - Brazil's Botafogo v Paraguay's Olimpia - Copa Libertadores - Nilton Santos stadium, Rio de Janeiro, Brazil - 15/2/17 - Camilo (R) of Botafogo and Cristian Riveros of Olimpia in action. REUTERS/Ricardo Moraes 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros celebrates his first goal. REUTERS/Mario Valdez 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros celebrates his first goal. REUTERS/Mario Valdez 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros (R) celebrates with teammate after scoring his first goal. REUTERS/Mario Valdez 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros celebrates his first goal. REUTERS/Mario Valdez 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros celebrates his first goal. REUTERS/Mario Valdez 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros (not in picture) scores. REUTERS/Jorge Adorno 

Football Soccer - Paraguay v Peru - World Cup 2018 Qualifiers - Defensores del Chaco Stadium - Asuncion, Paraguay. 11/10/2016. Paraguay's Cristian Riveros (2nd L) celebrates after scoring. REUTERS/Jorge Adorno 

Football Soccer - Paraguay v Colombia- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay- 06/10/16. Juan Cuadrado (L) of Colombia fights for the ball with Cristian Riveros of Paraguay. REUTERS/Mario Valdez 

Football Soccer - Paraguay v Colombia- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay - 06/10/16. Abel Aguilar (R) of Colombia fights for the ball with Cristian Riveros of Paraguay. REUTERS/Jorge Adorno 

Football Soccer - Paraguay v Chile- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay- 01/09/16. Chile's head coach Juan Antonio Pizzi (L), Edson Puch, Mauricio Isla (rear) and Aruto Vidal (8) react against Paraguay's Cristian Riveros (16) and Oscar Romero (R). REUTERS/Mario Valdez 

Football Soccer - Paraguay v Chile- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay- 01/09/16. Edson Puch (top) of Chile fights for the ball with Cristian Riveros of Paraguay. REUTERS/Jorge Adorno 

Football Soccer - Paraguay v Chile- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay- 01/09/16. Arturo Vidal (C) of Chile fight for the ball with Paulo Da Silva and Cristian Riveros of Paraguay. REUTERS/Jorge Adorno 

Football Soccer - Paraguay v Chile- World Cup 2018 Qualifier - Defensores del Chaco Stadium Asuncion, Paraguay- 01/09/16. Chile's Alexis Sanchez (7), Eduardo Vargas (L), Paraguay's Gustavo Gomez (R), Salustiano Candia (6) and Cristian Riveros (rear) in action. REUTERS/Mario Valdez 

Football Soccer - Boca Juniors v Cerro Porteno - Copa Libertadores - Alberto J. Armando stadium, Buenos Aires, Argentina 5/5/16. Boca Juniors' Cristian Pavon in action against Cerro Porteno's Jorge Rojas (R) and Marcos Riveros. REUTERS/Marcos Brindicci 

Football Soccer - Mexico's Pumas v Paraguay's Olimpia - Copa Libertadores - Olimpico Universitario stadium, Mexico City, Mexico, 06/04/2016 Cristian Riveros of Paraguay's Olimpia fights for the ball with Javier Cortes of Mexico's Pumas. REUTERS/Edgard Garrido

Football Soccer - Mexico's Pumas v Paraguay's Olimpia - Copa Libertadores - Olimpico Universitario stadium, Mexico City, Mexico 06/04/2016. Cristian Riveros of Paraguay's Olimpia celebrates his goal against Mexico's Pumas. REUTERS/Edgard Garrido

Football Soccer - Mexico's Pumas v Paraguay's Olimpia - Copa Libertadores - Olimpico Universitario stadium, Mexico City, Mexico 06/04/2016. Cristian Riveros of Paraguay's Olimpia celebrates his goal against Mexico's Pumas. REUTERS/Edgard Garrido

Football Soccer - Mexico's Pumas v Paraguay's Olimpia - Copa Libertadores - Olimpico Universitario stadium, Mexico City, Mexico, 06/04/2016 Cristian Riveros of Paraguay's Olimpia celebrates his goal against Mexico's Pumas. REUTERS/Edgard Garrido

Football Soccer -Mexico's Pumas v Paraguay's Olimpia - Copa Libertadores - Defensores del Chaco Stadium, Asuncion, Paraguay, 1/3/2016 Luis Fuentes (5) of Mexico's Pumas and Julian Benitez (23) and Cristian Riveros (L) of Paraguay's Olimpia fight for the ball. REUTERS/Jorge Adorno 

Cristian Rodriguez (top) of Argentina's Independiente fights for the ball with Cristian Riveros (bottom) of Paraguay's Olimpia during their Copa Sudamericana soccer match at the Defensores del Chaco stadium in Asuncion September 30, 2015. REUTERS/Jorge Adorno 

Juan Martinez (R) of Argentina's Independiente fights for the ball with Cristian Riveros (L) of Paraguay's Olimpia during their Copa Sudamericana soccer match at the Defensores del Chaco stadium in Asuncion September 30, 2015. REUTERS/Jorge Adorno

Luis Paez (bottom) of Colombia's Aguilas Doradas fights for the ball with Cristian Riveros (top) of Paraguay's Olimpia during their Copa Sudamericana soccer match at the Defensores del Chaco stadium in Asuncion August 26, 2015. REUTERS/Jorge Adorno

Jose Bizama (bottom) of Chile's Huachipato fights for the ball with Cristian Riveros of Paraguay's Olimpia during their Copa Sudamericana soccer match in Asuncion August 12, 2015. REUTERS/Jorge Adorno

Peru's Paolo Hurtado (C) fights for the ball with Paraguay's Cristian Riveros (R) and Edgar Benitez (L) during their international friendly soccer match in Estadio Feliciano Caceres, in Luque November 14, 2014. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Maximiliano Calzada (C) of Uruguay's Nacional competes for the ball with Edinho (L) and Cristian Riveros of Brazil's Gremio during their Copa Libertadores soccer match in Montevideo February 13, 2014. REUTERS/Andres Stapff (URUGUAY - Tags: SPORT SOCCER) 

Argentina's Lionel Messi (R) controls the ball between Paraguay's Salustiano Candia (C) and Cristian Riveros during their 2014 World Cup qualifying soccer match in Asuncion, September 10, 2013. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's national soccer team players Cristian Riveros (R) and Roque Santa Cruz attend a news conference in Ypane, near Asuncion September 9, 2013. Argentina will face Paraguay in a 2014 World Cup qualifying soccer match in Asuncion on Tuesday. REUTERS/Stringer (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's national team players Richard Ortiz (L), Pablo Aguilar (2nd R) and Cristian Riveros (R) attend a training session in Ypane, near Asuncion September 3, 2013. Paraguay will face Bolivia in a World Cup qualifying soccer match in Asuncion on Friday. REUTERS/Stringer (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's Cristian Riveros (R) battles Chile's Mauricio Isla during their 2014 World Cup qualifying soccer match in Asuncion June 7, 2013. REUTERS/Mario Valdez (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's Cristian Riveros (R) fights for the ball with Uruguay's Luis Suarez during their 2014 World Cup qualifying soccer match in Montevideo March 22, 2013. REUTERS/Andres Stapff (URUGUAY - Tags: SPORT SOCCER) 

Peru's Jefferson Farfan (L) falls while battling Paraguay's Cristian Riveros during their 2014 World Cup qualifying soccer match in Asuncion, October 16, 2012. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's Fidencio Oviedo (R) heads the ball as teammate Cristian Riveros (obscured) helps defend him from Peru's Claudio Pizarro (L) during their 2014 World Cup qualifying soccer match in Asuncion, October 16, 2012. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Peru's Paolo Guerrero (R) dribbles the ball past Paraguay's Cristian Riveros during their 2014 World Cup qualifying soccer match in Asuncion, October 16, 2012. REUTERS/Mario Valdez (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's Cristian Riveros (L) and Peru's Jefferson Farfan jump for the ball during their 2014 World Cup qualifying soccer match in Asuncion, October 16, 2012. REUTERS/Mario Valdez (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's national soccer team players Edgar Benitez (R) and Cristian Riveros take part in a training session in Defensores del Chaco stadium in Asuncion September 10, 2012. Paraguay will face Venezuela in their 2014 World Cup qualifying soccer match in Asuncion on Tuesday. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Argentina's Lionel Messi (C) dribbles the ball under pressure from Paraguay's Victor Caceres (L) and Cristian Riveros during their 2014 World Cup qualifying soccer match in Cordoba September 7, 2012. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT SOCCER) 

Argentina's Lionel Messi (C) dribbles the ball under pressure from Paraguay's Victor Caceres (R) and Cristian Riveros during their World Cup 2014 qualifying soccer match in Cordoba September 7, 2012. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT SOCCER) 

Argentina's Rodrigo Brana (back) and Paraguay's Cristian Riveros compete for the ball during their World Cup 2014 qualifying soccer match in Cordoba September 7, 2012. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SPORT SOCCER) 

Argentina's Lionel Messi (L) dribbles the ball under pressure from Paraguay's Victor Caceres (15) and Cristian Riveros during their World Cup 2014 qualifying soccer match in Cordoba September 7, 2012. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SPORT SOCCER) 

Paraguay's national soccer team players Oscar Cardozo (R), Cristian Riveros (C) and Julio Dos Santos (L) attend a training session in Ypane, some 30 km (19 miles) from Asuncion September 5, 2012. Paraguay will face Argentina in their 2014 World Cup qualifying soccer match in Cordoba, Argentina, on September 7. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Paraguay's national soccer team players (front, L to R) Richar Ortiz, Salustiano Candia, Cristian Riveros, Dario Veron and Antolin Alcaraz attend a training session in Ypane, some 30 km (19 miles) from Asuncion September 3, 2012. Paraguay will face Argentina in their 2014 World Cup qualifying soccer match in Cordoba, Argentina, on September 7. REUTERS/Jorge Adorno (PARAGUAY - Tags: SPORT SOCCER) 

Boca Juniors' Diego Rivero (L) fights for the ball with Olimpo's Cristian Villanueva during their Argentine First Division soccer match at La Bombonera stadium in Buenos Aires February 10, 2012. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT SOCCER) 

Chile's Matias Fernandez (L) challenges Paraguay's Cristian Riveros during their 2014 World Cup qualifying soccer match in Santiago November 15, 2011. REUTERS/Ivan Alvarado (CHILE - Tags: SPORT SOCCER) 

Paraguay's players Sergio Aquino (L), Cristian Riveros and Miguel Samudio (R) react after their 2014 World Cup qualifying soccer match against Chile in Santiago November 15, 2011. REUTERS/Ivan Alvarado (CHILE - Tags: SPORT SOCCER)