ESPN:
The Argentina squad contains four Premier League players -- the Tottenham Hotspur pair of Cristian Romero and Giovani Lo Celso plus the Aston Villa duo Emiliano Martinez and Emiliano Buendia. The squad arrived in Brazil on Friday morning after the 3-1 win away to Venezuela on Thursday.
Just as Brazil is on the UK's 'red list' the reverse is also true. Non-Brazilians who have been in the UK in the past 14 days need to go into quarantine. According to a statement from the Anvisa health authority, these four players did not declare to the local immigration authorities that they had been in the UK in the previous two weeks.
It was clear on Saturday, the eve of the game, that there was going to be a problem.
CNN:
The World Cup qualifier between Brazil and Argentina was suspended minutes after kick-off at the Corinthians Arena in São Paulo, Brazil after Brazilian health officials came onto the pitch and escorted multiple Argentinian soccer players away.
The Brazilian Health Regulatory Agency (Anvisa) had requested support from the country's Federal Police to prevent four Argentinian players from participating in the qualifier
Surreal: Brazil v Argentina stopped inside 7 mins by Brazilian Federal Police walking on field to detain 4 Argentinian Premier League players who failed to disclose they are based in Britain, breaking COVID protocols upon entering Brazil. Chaos ensued 🇧🇷🇦🇷 pic.twitter.com/ANG5L61SaK
— roger bennett (@rogbennett) September 5, 2021