Brazil internationals Richarlison and Vinicius Jr had to be separated after coming to blows during a heated training session.
The two players were spotted grabbing each other's shirts as the row unfolded on Saturday. Experienced internationals Neymar and Dani Alves were among the players to rush over and quash the disagreement, and it's unclear what triggered the incident.
Brazil are one of the favourites to win this year's World Cup in Qatar and are preparing for the tournament by playing friendlies in Asia this month. They hammered South Korea 5-1 on Thursday - with Richarlison scoring - and take on Japan on Monday.
The altercation between the pair comes just days after Richarlison was filmed congratulating Vinicius for winning the Champions League. The Brazilian scored the winner for Real Madrid in their 1-0 victory over Liverpool in Paris last month.
Everton star Richarlison even celebrated the win on social media. He posted a mock-up of himself as a bus driver after a coach taking Liverpool supporters to the final in France didn't turn up. Toffees fans joked the driver's name was "Richard Arlison".
Richarlison also congratulated Vinicius on Instagram after he scored a brace against Liverpool in their Champions League quarter-final last season. It's unclear whether the two are friends, and if their falling out is anything to worry about ahead of the World Cup.
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Brazil haven't won the competition for 20 years, when it was last held in Asia. In fact, no South American nation has tasted success since Brazil's triumph. Argentina have come the closest to glory, losing 1-0 to Germany in the final in Brazil eight years ago.
Ballon d'Or winner Kaka, who was part of the last Brazil team to lift the World Cup, believes the current crop of players can be victorious in Qatar. "We just finished the qualifying [round], topping the table," said the AC Milan legend, as quoted by Arab News.
"It’s been a very good job with Tite, the coach who’s been there since the last World Cup, with a lot of young players coming out and growing at the right moment. This is why in my opinion Brazil will be one of the favourites."
Kaka added: "Tite is very good with tactics, he understands the players, the way to play. And he gave this team an identity. So we can see Brazil playing very well. Another good thing that just happened in the last few games was that Brazil played very well without Neymar.
"It doesn’t mean that we don’t need him. We do need him. But I think when we take away all this responsibility from him, we also give him more opportunity to shine. So this is why Brazil can make the difference in the World Cup."
Kaka went on to say: "France will be one of the favourites. Germany, too, they have a very, very good team. Of course, when you talk about Cristiano Ronaldo, Portugal will be always a very strong national team and tough to play. Argentina, with [Lionel] Messi, as well, and Belgium. And Spain is doing very well. In my opinion, it will be those teams."
