Former opener Adam Gilchrist has urged Australia's newest batting sensation David Warner to stay calm.

Warner put up a sizzling show on debut, hitting a 43-ball 89 against South Africa in the first Twenty20 match, but his bat has remained silent since then.

Retired Gilchrist said Warner should not think about his first knock when he steps on the field in the the third one-day match against the Proteas tomorrow in Sydney.

"Don't put too much pressure on yourself, I always felt that pressure came from within, it is not a matter of the headlines or the air time that you received.

"So for him to relax and try to stay true to the processes he normally goes through and the results will come again eventually," Gilchrist said.

The former left-hander lauded Warner's effort in his debut match.

"Obviously that initial knock of his of 80-odd off 40 balls was very exciting. I was there watching it and I loved it.

"It was terrific, a great spectacle but for him just try now not to think that every time he does it he has to produce that sort of result because the reality is it does not work that way," Gilchrist told AAP.

The five-match one-day series between the two teams is locked 1-1.