Clarke says Warner will reform Australian captain Michael Clarke says he's confident an altercation with Ashes rival Joe Root in a Birmingham bar will be David Warner's last indiscretion. However, Clarke said it was up to Warner to prove that he can be trusted. Warner was a vice-captain candidate for Australia a matter of months ago, but Clarke maintained he still sees leadership potential in the opening batsman despite his growing rap sheet of off-field indiscretions. But Clarke said it was far from the right time to be sitting down spruiking those qualities. Warner pleaded guilty to unbecoming conduct at a Cricket Australia hearing on Thursday, and was fined $11,500 and suspended from cricket until the first Test of the Ashes. It was just three weeks since he was fined nearly six thousand dollars for abusing two Australian journalists on twitter. Clarke said Warner wasn't the first athlete to make an error of judgement but stressed enough is enough. "I've said for a long time, it's not what you say, it's what you do," he said. This is an opportunity for Dave Warner to show this is not what he says, it's what he does. We also need to respect the fact that through all of our lives, you have some tough days. He'll learn from this. It'll make him a better person. It'll make him a better player. I have the confidence in David that we won't be sitting here having this conversation again. Clarke said he was part of the leadership group that stood Warner down for Wednesday's Champions Trophy match but that the code of conduct hearing took the matter out of his hands. Warner won't play again in the ODI tournament and will sit out the two tour games that precede the first Ashes Test at Trent Bridge on July 10. Clarke defended the management of the Australian cricket team. The skipper says the culture in the team is improving despite an issue on the last tour to India where four players were stood down from the fourth Test for failing to do their homework. Coach Mickey Arthur declared the standing down of vice-captain Shane Watson, Usman Khawaja, James Pattinson and Mitchell Johnson was a "line in the sand moment" in regards to behavioural lapses in the Australian team. Clarke said that line in the sand had not been crossed. No not at all. I think we made it very clear our the reasons for our decision in India and I still stand firm by them," he said. I believe we made the right decision for the team at that time. Although the punishment once again for David is quite harsh, that's the reality when you play for the Australian cricket team. The culture we are trying to create and set up here you need to make sure you're doing the right things.