Mourinho: "No untouchables at Chelsea" | Watch pre-porto press conference
Chelsea's players have been told that no-one's place is safe if the club's poor start to the season continues.
"Untouchables in football - only consistency can give you that status," said Mourinho, whose side are 14th in the table after seven games.
"Football is about today. At this moment I don't have untouchables."
"In this moment we have fantastic players, the players that gave us the title last season," Mourinho said.
"But football is not about yesterday. In football you have to be consistent in your performance, in your emotion.
"To be a winner you don't need to win all the time, but to be a winner you must have a strong mentality every game, every day."
Mourinho was speaking ahead of Chelsea's Champions league match away at Porto.
Watch the full match conference below: