Former England batsman Geoffrey Boycott has admitted that he is not sure if Andy Flower is still the right man to be in charge of the team following their Ashes humbling in Australia.
The hosts outclassed England during the first and second Tests before clinching victory by 150 runs in the third meeting in Perth on Tuesday to end a run of three straight defeats in the competition.
With Flower's contract due to expire at the end of the series, Boycott is pondering whether or not now is the right time to move into a new era.
"Does Andy Flower see the problems in his England side and have the balls to make big changes? Or will he want out?" Geoff Boycott told the Daily Mail.
"Remember he has given up the running of the 50-over and Twenty20 sides to have more time off.
"If you are going to build another team to challenge the world it requires mental strength and strong desire from the coach."
The fourth Test gets underway late on Christmas Day in Melbourne.
