The Blues have been made a red-hot start to the campaign with four wins and one draw and are considered favourites to take the league crown from Manchester City.
However, Mourinho has stressed that his players can not let their emotions get the better of them as he felt they did in the 1-1 draw with Manchester City as Chelsea hero Frank Lampard netted the equaliser.
“Against 10 men, we’d won the game,” the Portuguese tactician told reporters. “I think when the game gets emotional, it doesn’t matter that it’s 10 versus 11 – the numbers are not important.
“When the game is tactical, yes, they do. And when the game was tactical we felt even before the red card, because we sent on Schurrle to win the game, that we were doing it right.
“Against 10 we tried, we scored, we hit the post and had the game apparently under control. But then they scored and the last five minutes the game was emotional and they were psychologically stronger than us, when the crowd got behind them.
“The Premier League, at this moment, is not just different, I think it’s crazy.
“We had the 6-3 at Everton, United were winning 3-1 and then lost 5-3 at Leicester, Palace went to Everton and won. More than special, I think the Premier League has become a bit crazy.”