Sarri was speaking after victory over Bologna.
He said, "It is a completely abnormal situation and there is nothing that it can be related to, so it is very easy to make mistakes in the physical preparation.
"These are teams that are not in an ideal physical constitution and you will have matches that are played at very high temperatures, so I think it will be difficult for all teams.
"I do not foresee good football, as the high temperatures mean that the pace will not be very high, and people have become accustomed to watching. It will be difficult for everyone and with possible surprises in all matches."