Gremio players wearing masks before the match is played behind closed doors as the number of coronavirus cases grow around the world during Campeonato Gaucho match between Gremio and Sao Luiz at Arena do Gremio, Porto Alegre, Brazil, March 15, 2020. Players from Brazilian club Gremio took to the field wearing masks on Sunday in protest at having to play a soccer match as fears over coronavirus grow in the South American nation. REUTERS/Diego Vara

Gremio players wearing masks before the match is played behind closed doors as the number of coronavirus cases grow around the world during Campeonato Gaucho match between Gremio and Sao Luiz at Arena do Gremio, Porto Alegre, Brazil, March 15, 2020. The protest comes as players and clubs across South America are starting to complain at decisions by footballing authorities to order games to be played, but behind closed doors. REUTERS/Diego Vara

Gremio players wearing masks before the match is played behind closed doors as the number of coronavirus cases grow around the world during Campeonato Gaucho match between Gremio and Sao Luiz at Arena do Gremio, Porto Alegre, Brazil, March 15, 2020. Players from Brazilian club Gremio took to the field wearing masks on Sunday in protest at having to play a soccer match as fears over coronavirus grow in the South American nation. REUTERS/Diego Vara

Gremio players wearing masks before the match is played behind closed doors as the number of coronavirus cases grow around the world during Campeonato Gaucho match between Gremio and Sao Luiz at Arena do Gremio, Porto Alegre, Brazil, March 15, 2020. The protest comes as players and clubs across South America are starting to complain at decisions by footballing authorities to order games to be played, but behind closed doors. REUTERS/Diego Vara

Gremio players wearing masks before the match is played behind closed doors as the number of coronavirus cases grow around the world during Campeonato Gaucho match between Gremio and Sao Luiz at Arena do Gremio, Porto Alegre, Brazil, March 15, 2020. Players from Brazilian club Gremio took to the field wearing masks on Sunday in protest at having to play a soccer match as fears over coronavirus grow in the South American nation. REUTERS/Diego Vara

Gremio pose for a team group while wearing masks before the match is played behind closed doors as the number of coronavirus cases grow around the world during Campeonato Gaucho match between Gremio and Sao Luiz at Arena do Gremio, Porto Alegre, Brazil, March 15, 2020. The protest comes as players and clubs across South America are starting to complain at decisions by footballing authorities to order games to be played, but behind closed doors. REUTERS/Diego Vara