Ibrahimovicâ€™s friend Tony Flygare, who grew up with him in Rosengard, Sweden, has made the extraordinary claims in bestseller 'Once, I Was Bigger Than Zlatan'.
He trained with the QPR reserve team for a week but was not asked back.
Flygare told the Daily Mail: "Zlatan was holding on to the ball for too long and the trainer tackled him when he wasnâ€™t expecting it.
"For that, Zlatan tackled him back and then told the trainer to â€ś**** offâ€ť. He went mad at Zlatan.
"Being in England was so much different. He just told Zlatan: â€śfor that, youâ€™re going to breathe through your a***â€ť. Iâ€™ll never forget it. We didnâ€™t hear from QPR again.
"Zlatan didnâ€™t want to play or stay in England, that is my opinion."
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