Chelsea sit seven points clear at the top of the Premier League going into this weekend's round of fixtures.
Tottenham could close the gap to just four points if they beat Bournemouth this afternoon, with Chelsea not playing until tomorrow when they visit Manchester United.
Chelsea have occupied top spot in the league since November and a run of 15 consecutive wins yielded just four goals in the process.
Thibaut Courtois wants Chelsea to end the run of games without a clean sheet
Chelsea have conceded 10 goals in their last nine Premier League games
But in their last nine league games, Antonio Conte's side have failed to keep a clean sheet and have conceded 10 goals.
And Courtois admits shipping in too many goals puts the onus more on Chelsea's attackers to score.
"I think in some games we can be unfortunate with a penalty or a quality free-kick but in some games we were maybe not concentrating as much or as fully committed as before," Courtois told Sky Sports.
Chelsea stars in training as full-strength Blues prepare for Man United clash Fri, April 14, 2017
Express Sport brings you the best pictures from Chelsea's latest training session as the Blues prepare to take on Manchester United at Old Trafford on Sunday (4pm)
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Chelsea were hard at work in training ahead of their clash with Man United
"We had a beautiful run of six or seven clean sheets and in a spell of winning 13 games I think we only conceded two or three goals.
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"It's a pity to concede goals but it's most important to win our games. That is what we are doing.
"It's very important as well that we score goals because at the moment we concede a bit too much."