Former Indian captain Sourav Ganguly has been very impressed with RCB and Indian Test skipper Virat Kohli. Dada, the man who introduced a whole new dimension of courage and aggression into Indian cricket has been heaping praise on Kohli. â€œI am a big fan of Virat Kohli. He is a captain who always wants to win matches on the field and I love that passion in him. I love the attitude and aggression in Kohli. He might lose sometimes and win sometimes but you know that he is playing to win it,â€ said Ganguly. He however feels that Kohliâ€™s main test will come when he leads the team into the 5-day-format outside India. â€œIt is also a proud moment for all to see him lead a side with such passion. I want Kohli to do better than me as a skipper. But his main challenge will be when India will tour abroad. Australia, England, South Africa will test his captaincy. All the best to him for the South Africa series,â€ he said. Sourav believes that though South Africa is a tough team to beat. And that weâ€™re in for a really tough yet compelling tour. â€œSouth Africa series will be a competitive series. They have a good team and India has recently played well in Sri Lanka. It is a long series. I always say that at home India is always a strong side. South Africa has bowling quality to take 20 wickets, India too has quality bowlers along with spinners on these spinning tracks. It will be a challenge for South Africa to hold on to their form for such a long tourâ€.