At the weekend South African journalist Jani Allan claimed that the athlete, who is currently on trial for the murder of Reeva Steenkamp, took lessons from an actor to help him appear emotional.
His media manager, Anneliese Burgess, has now spoken out to deny the claims, saying they are: 'totally devoid of any truth.'
Over the course of seven weeks, Pistorius has broken down crying, retched and vomited in court as he has been forced to relive the night of 14 February 2013.
But columnist Jani Allan posted on her website that the star had taken acting lessons for the purpose of the trial. 'Oscar you are the latest in a long line of faux heroes' she wrote.
She goes on: 'Oscar, I look at you mewling and puking in the witness stand. You truly represent everything that the West loathes about white South Africans who live extravagant lives in their expensive laagers. Your constant and preposterously ridiculous statement that you thought it wasn’t Reeva trapped in the bathroom, but an intruder, opens yet another can of haricots. The implication of this is that it would have been more acceptable to shoot an intruder the way you did. Execution from behind a closed door.'
Responding to the claims, Pistorius's media manager wrote: 'We deny in the strongest terms the content of her letter in as far it relates to our client and further deny that our client has undergone andy "acting lessons" or any form of emotional coaching.'
The trial is currently adjourned until May, after an intense 7 weeks of evidence. Pistorius maintains that he fired four shots through a closed bathroom door, killing his girlfriend, because he thought she was an intruder.