There is no official line on the development yet from IPL, and Brook himself has not cited any reason behind him opting out. However, he is considered a frontrunner to replace Jos Buttler as England’s white-ball captain following their group-stage elimination at the Champions Trophy, and, as an all-formats player with 18 months yet to run on his ECB central contract, workload management could prove to be a factor in the withdrawal. The ECB has been contacted for comment.