Football and hotel bosses ordered an urgent review of security after two intruders strolled into the England team's hotel.
The outer police ring surrounding the hotel was compromised by the South African fans, who walked into the lobby at the Royal Marang.
FA guards spotted the men, who were immediately escorted from the premises although they were not arrested.
A source at the hotel in Rustenburg told British daily, The Mirror: "The security staff have been given a rocket. It's worrying but has been seen as a wake-up call."
The FA added that there had been no threat to players.