Jose Mourinho has taken another swipe at Chelsea, admitting that he has been surprised by how much his former team have relied on defence and counter-attacks under Antonio Conte this season.
Chelsea will take on Mourinho's Manchester United at Stamford Bridge with a place in the FA Cup semi-finals at stake on Monday, and are chasing a double after building a 10-point lead at the top of the Premier League.
I'm not surprised [by Chelsea's success]. I'm surprised with the way they play.
I'm surprised because I thought they were demanding a different kind of football.
I think they are very good defensively and I think they have fantastic players to be a counter-attack team and to kill opponents with three or four players.
David Luiz thinks Chelsea are remaining grounded despite their commanding advantage at the Premier League summit.
The Blues beat Swansea 3-1 on Saturday to move 11 points clear of Manchester City, their nearest rivals entering this weekend's fixtures.
Luiz told Chelsea TV: "(We) need to go game by game. Premier League everybody knows is difficult.
"So keep the feet on the floor, with humility, working hard. That's the way."
It was as if Chelsea head coach Antonio Conte was speaking – the Italian has previous experience of slipping up in the home straight while he was a player with Juventus.
And Conte does not want a repeat as he vowed Chelsea would focus only on themselves. The Blues next play at West Ham on March 6.
"(Eleven points) is not the reality," Conte said.
"The other teams have to play the game. For sure we have to look at ourselves, to play game by game and to continue to show we are deserving to stay at the top of the league."
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Antonio Conte insists he is "not scared" to give Chelsea's talented youngsters a chance to contribute to the club's Premier League title charge.
Chelsea booked their place in the FA Cup fifth round with a 4-0 win over Brentford on Saturday, as Conte gave rare starts to Kurt Zouma, Nathan Ake, Nathaniel Chalobah, Ruben Loftus-Cheek and Michy Batshuayi.
I think that our young players are growing and for the club, for me, it's very important.
In this season we haven't Champions League or Europa League. We have only the league now and the FA Cup.
FA Cup is a good opportunity to see these young players, the improvement in these young players.
Young players for me, for the club are very important. If they deserve to play, I'm ready to put them in the team, in the squad.
I'm not scared of the young players. The only thing I must ask is they must be ready to play.
Branislav Ivanovic scored on his potential farewell appearance as Chelsea beat neighbours Brentford 4-0 in the FA Cup fourth round at Stamford Bridge.
Brentford, 15th in the Championship, took Chelsea to a replay four years ago, but there was little prospect of a repeat as the Blues claimed a 10th successive home win.
Willian, Pedro and Michy Batshuayi, with a penalty, were also on target for the Premier League leaders, whose only concern came when Willian went off midway through the second half after earlier holding his ankle.
Ivanovic replaced Willian and scored his 34th Chelsea goal on his 377th appearance, amid suggestions his nine-year stay at Stamford Bridge could come to an end before Tuesday's transfer deadline.