Craig Bellamy has already had a blow-up with West Ham boss Alan Curbishley - only weeks after his arrival from Newcastle United.
The Sun says Bellamy shocked his new team-mates by sensationally laying into Curbs after the Hammers' 2-0 opening-day defeat to Manchester City.
A close source said: "Bellamy had a real go. He really let Curbishley have it.
"He was really upset about how the team played. Everyone was shocked to see the pair at each other's throats. It was incredible."
Bellamy, who was making his Premiership debut for the Hammers, was furious at Curbishley's tactics and let him know afterwards with both barrels.
But his outburst could now leave his career in tatters, having only just signed for £7.5million from Liverpool this summer.