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Dhoni was part of the CSK team which selected the players during auctions. Despite widespread criticism that the team is full of 35 plus players, he took no additional step to include fresh blood. There were no replacement for players who became unavailable. When Suresh Raina pulled out (due to some issues with the CSK management), the replacement for him was not available. Even this time, CSK went for players such as Robin Uthappa, who belongs to the 35 plus category.
Not sure whether Dhoni has any say in the auction process when selecting the players, the team management who spends the money and the coaching members will take care of the team selection as far as i know. This time around they rectified all their issues and they were having one of the best seasons with new additions in the team and i was expecting them to dominate this years IPL.