"I am not too sure if Dhoni is a good T20 player. He is a champion ODI player but when it comes to T20 cricket, in 10 years, he has got one fifty and that's not the best record," Ganguly told India Today.
Ganguly's scathing comments came on the back Dhoni's ever-falling run in the shortest format of the game.
Dhoni, who has been relived of captaincy duties by Rising Pune Supergiant and is playing for the first time as a player in the Indian Premier League, hasn't performed as per the expectations in the ongoing league.
Ganguly, however, said Dhoni is too good an ODI player to be ignored from India's Champions Trophy squad.
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"I will pick Dhoni for the Champions Trophy but he has to score runs," Ganguly said.
Former Australian captain Michael Clarke also feels it is high time for Dhoni to explode with the bat.