David Warner said Mahendra Singh Dhoni has been a good helping hand for Virat Kohli, the fiery India captain.”MS Dhoni brought a sense of calmness to his captaincy. He did a great job as captain and he is still doing a great job, nurturing Virat and that is a great thing to do for a former captain,” Warner told India Today’s Boria Majumdar. “He is nurturing Virat and that is a good thing to do for both men.”WATCH FULL VIDEOHowever, Warner said Kohli’s real challenge would come when he goes through a lean patch as captain. After taking over as full-time captain of the limited-overs teams, Kohli has led India to series wins over England, West Indies and Sri Lanka. (Pressure will be on Kuldeep Yadav to perform, not me: David Warner to India Today)Kohli also led India to the final of the Champions Trophy and the hosts currently lead Australia 2-0 in the ongoing ODI series . He has also had plenty of success as Test captain, winning 19 of 29 matches in nearly three years.Reuters Photo”Virat has not had a lot of non-success as captain but the real challenge comes when you start losing games,” Warner said.”The real test comes when you start losing some games. We are here for another three matches to go and hopefully we can turn that around and maybe we will see a different captain,” he said.Warner said Australia were disappointed to lose the Kolkata ODI after restricting a powerful Indian batting line-up to 252 despite a superlative 92 from Kohli and a fluent 55 from Ajinkya Rahane.advertisementIn energy-sapping conditions at the Eden Gardens, Australia did well to pull things back before losing their way with the bat for the second time this week.”We always talked about how if you restrict the Indian team to under 300 in their conditions, you are going a long way to winning the game. We did not get that key partnership in the middle.”The ball was swinging and it was challenging conditions. Bhuvi and Bumrah bowled brilliantly upfront. We lost two early wickets, established a partnership in the middle but did not have that one batsman going on to get a big score,” Warner said, summing up the 50-run defeat.