Azpilicueta [l] is a crucial player in Mourinho's line-up [Reuters] Reuters

Cesar Azpilicueta has hailed Jose Mourinho's new attacking style, admitting that Chelsea now play "better football collectively" than last season.

The West London side lead the Premier League after an impressive start to the season with three victories in the first three games.

And while last season some pundits questioned Mourinho's defensive approach his team have already silenced any doubters this season by scoring 11 goals.

"I'm happy because we are scoring goals and I think we are playing better football collectively. We are on our way to progressing and trying to improve in every game," Azplilicueta told Chelsea's official website.

"We are a young team and we want to play better and win more games - that's the most important thing. You don't do anything playing well, having possession and not scoring any goals.

"Last year sometimes we had to play very, very well to score goals. At the moment it looks easy and obviously Diego [Costa] has scored a lot of goals. We have a very good squad and we've started with three games and three wins."

New signing Costa has scored four goals in three Premier League games, netting the crucial opener in each one.

"We are happy to have him in our team. He's always a competitive guy and he can be a nightmare for defenders," the full-back said.

"He's a worker, too. He saw the moments to come as a winger when Eden wasn't on the left wing. He saw the space to cover and this is the most important thing: to play as a team."

Nevertheless, Azpilicueta has urged the team to improve in defence after conceding three goals in their 6-3 victory over Everton on Saturday.

"We defenders are not happy when we concede this many goals. I like to see my mistakes, or the team's mistakes, because after we have the possibility to improve as a team. If you don't make any mistakes, you cannot improve," the Spaniard admitted.

"As a defender I would rather win 1-0 than 6-3, but after we win with three goals difference, I think it's good because the strikers like to score. It's good for their confidence. At least we got the three points at the end."