Eddie Nketiah and Dani Ceballos had to be separated by team-mates following an angry exchange before Arsenal’s Premier League opener at Fulham.
The players, who were both named amongst the substitutes at Craven Cottage, were taking part in the pre-match warm-up when the flare-up happened at Craven Cottage.
It took place during a short passing drill and the flash point came when Ceballos - who has just returned to Arsenal on a season-long loan from Real Madrid - caught Nketiah with a late challenge as he tried to claim a loose ball.
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The young Gunners striker clearly said something to his Spanish team-mate, who responded by angrily shoving Nketiah away before shouting at him as he prepared to restart the training drill.