The BCCI doesn't have a window to host 90-plus matches at the moment. But a nine-team IPL will bring the number of matches down to 76, for which the existing window can be stretched. ​​A final call is expected to be taken during the AGM on December 1.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/ipl/bcci-contemplating-nine-team-ipl-instead-of-10-for-now/articleshow/72152545.cms