"We have written to the ICC that the six-match ban is too much. We are taking this up with the ICC," Mahendra said after BCCI's two-day working committee meeting.
Ganguly was banned for six One-day Internationals by ICC match referee Chris Broad after the Indian captain was found guilty for his side's slow over rate during the One-day series against Pakistan.
Ganguly, whose appeal against the ban was later turned down by ICC appeals commissioner Tim Castle, has already missed two matches -- fifth and sixth One-dayer against Pakistan in April.
If the ban stays, he would miss the tri-nation series in Sri Lanka in August where West Indies is the third team.