David Warner has credited former chairman of selectors, Greg Chappell, for his recent success in the NCL T20 and said he is now targeting a Test debut next year.

Warner had an incredible run-scoring feast during the Nokia Champions League Twenty20 with New South Wales, scoring 258 from 137 balls in his final two matches.

The 24-year-old left-hander feels Chappell, a former Australian skipper, was instrumental in improving his batting technique.

"Chappell has been wonderful in the way he has guided me through with my batting in the last few months. I think he is a great cricketer and I've learnt a lot from him," Warner was quoted as saying in the Daily Telegraph.

Warner, who is the first player to score back-to-back centuries in the game's shortest form, is now seriously developing himself for the longer format.

"I started my career with T20 and it has helped me develop as a player," said Warner.

"However, my goal is to make my Test debut next year. T20 is a great forum to score runs and a stepping stone to ODIs and Tests. It's important that a player is not hemmed in by one particular format."

Warner is now in South Africa, where he will be part of Australia's squad for the 50-over and Twenty20 matches.