The 27-year-old athlete's spokeswoman confirmed the altercation took place but insisted Pistorius had been sitting quietly in the VIP section of the club, in the upmarket district of Sandton in Johannesburg, when he was approached.
The man, named by South African news website The Juice as Jared Mortimer, claimed Pistorius was "drunk and very aggressive" and poked him in the chest while telling him "you'll never get the better of me".