Rarely tested in the first half, he had to be at his very best after the break, twice making brilliant saves to deny Nugent - the second from a one-on-one. Petr Cech isn't getting back into this team any time soon.
Marshalled his defence with trademark assurance and was particularly impressive whenever called upon to cover for Azpilicueta.
Typically dominant in the air and made sure that Ulloa could not trouble Courtois.
Hazard's unwillingness to track back meant that he was often left one-on-one with Mahrez but he invariably coped with the situation well. Never much of an attacking threat on his weaker foot.
Troubled whenever Schlupp and Konchesky were able to double up on him but poor crossing ensured that he did not pay the price. Always a force in the air and one flying attempt forced an excellent save from Schmeichel. His surging run and pass set up Costa's goal.
Unable to stem the tide of Leicester forays forward early on, he upped his level in the second half. His interceptions and quick passes provided a foundation on which Chelsea could build.
Not able to deliver the kind of virtuoso performance he produced against Burnley but far more dangerous after half-time, testing Schmeichel with a delicate chip and playing his part in several swift Chelsea attacks.
Ineffective in the final third in the first 45 minutes, while also leaving Azpilicueta exposed on numerous occasions with his unwillingness to track back. More of a threat after the break and scored a classic goal as Leicester tired.
Still resides for the most part on the periphery of matches but almost scored himself with a curling effort which struck the post and played the brilliant pass which broke the deadlock, releasing Ivanovic into the box and enabling him to find Costa.
Did not test Schmeichel in the first half and his attempts to link up with midfield runners exposed the weaknesses in his game but he was always alert in the penalty area and, when his moment came, he took his chance.
Always a willing runner but could not find the space in behind to really hurt Leicester. There were further promising signs of a burgeoning understanding with Fabregas, though.
Made several excellent stops to prevent Ivanovic and Fabregas opening the scoring but was largely powerless to stop the predatory Costa from doing just that or Hazard from making the game safe late on.
Limited Costa's chances well but the Spaniard took the one that he did get. Also could not stop Hazard putting the game to bed, despite getting a toe to the Belgian's shot.
Supported Schlupp well and kept Schurrle largely quiet but Chelsea's opening goal came down his flank.
Helped restrict Costa's space in the box but Chelsea's midfield movement gave him problems that he could not solve in the second half.
R. De Laet
Caused Azpilicueta problems whenever he bombed forward to support Mahrez in the opening exchanges but was bested by Hazard as he tired in the second half.
Harried Fabregas well for the first half, even dispossessing the Spaniard a couple of times. Could not provide any inspiration for his side going forward, though, and Chelsea passed around him after the break.
Filled in for Drinkwater impressively and played a role in disrupting the home side's rhythm in the first half but Chelsea took the game away from him when they upped their level in the second.
Tracked Schurrle well defensively and caused Ivanovic a couple of problems with his runs forward, though his final ball invariably let him down.
Consistently Leicester's most dangerous attacking outlet, only poor decision-making and good Azpilicueta defending stopped him doing real damage in the first half. Set up Nugent's one-on-one in the second half - arguably the game's decisive moment.
A physical presence up front but largely anonymous as a goal threat, failing to test Courtois.
Had his team's two best chances but found Courtois more than equal to the task on both occasions. One suspects that he will not be the last striker to go home cursing the giant Belgian this season.
Replaced Oscar on 70 minutes left and stung the palms of Schmeichel with a fierce drive.
Came on for Schurrle on 64 minutes and thrived as the game became more stretched.
Made his Stamford Bridge return to a huge ovation with 10 minutes remaining, coming on for Costa.