RODRIGO DE PAUL slapped Lionel Messi as the pair joked around in Argentina training.
A video has gone viral of De Paul messing around with Messi in Miami during a session.
In the clip, Messi can be seen saying something to De Paul, prompting a playful slap from the midfielder.
Both players can be seen smirking after the incident, with Leo's former PSG team-mate Leandro Paredes also grinning as he led De Paul away.
According to Mundo Deportivo, De Paul mouthed "Are you stupid, Leo?"
The Atletico Madrid star is sporting a bleached blond barnet over in the United States, where Argentina are based this week.
De Paul and Messi go way back, with the Atleti ace having earned his first international cap in 2018.
The duo won the Copa America together in 2021, Messi's first international trophy.
Argentina take on Honduras tonight at Miami's Hard Rock Stadium.
They will then face Jamaica on Tuesday night in their penultimate match before the World Cup in Qatar.
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Lionel Scaloni's side are then due to play the United Arab Emirates on November 16, before kicking off their World Cup campaign six days later.
Argentina will get their Group C endeavours underway against Saudi Arabia on November 22.
They are then set to take on Mexico and Poland in their other group matches.