There may be a ceasefire on the field, but South African cricket fans aren't planning to take it easy on Australian opener David Warner.

The second Test between begins on Friday night at St George's Park in Port Elizabeth, and fans planning to attend the match are preparing by making Sonny Bill Williams masks to taunt Warner.

Williams and Warner's now wife, Candice Warner, were involved in a toilet tryst in 2007. Another patron took a photo of the pair under the toilet cubicle door, and the images went worldwide.

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It is understood that Quinton de Kock's retort to Warner's sledging was to mention Williams and his brief relationship with Warner's wife.

Warner was fined 75 per cent of his match fee for the incident, in which he had to be held back by teammates as the teams returned to the changing sheds in Durban.

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