Mourinho told Chelsea's official magazine: "The new pre-season will be not perfect but almost perfect.
"I believe for 60 matches played in a season, six weeks' holiday would be more adapted to the needs of the players' bodies and minds.
"And to be completely perfect we should start the season with every player and I am not sure of that because we have some surgeries during this period and I cannot guarantee that, for example, Ashley Cole, Ricardo Carvalho and so many of the boys will be back at the start.
"Also maybe we have a couple of new South American players and because the South American Cup is played in June and we have a Brazilian like probably we will have in Alex, he cannot start this pre-season.
"He would have been playing for the national team, but at least we have a proper pre-season, one month, six matches to play, almost everybody at the start training properly, more or less in the same way as all the other contenders for trophies."