Kolkata, March 21 -- Varun Chakravarthy has endured a difficult T20 World Cup where he conceded 9.25 runs per over despite taking 14 wickets but Kolkata Knight Riders head coach Abhishek Nayar and captain Ajinkya Rahane feel nothing is necessarily wrong with the spinner. KKR start this IPL season relying heavily on the spin duo of Chakravarthy and Sunil Narine but the Indian spinner's recent returns have raised concerns that the bowling attack - that has already lost Harshit Rana to injury - may not have enough sting. "With Varun, he's played so much T20 cricket over the past year," said Nayar, who has taken over as coach from Chandrakant Pandit this year, at KKR's press conference here on Friday. "So, a lot of teams will obviously try thin...