The Foxes travel to west London eighth in the Premier League, having won eight games this season, while Chelsea will hope a win can see them climb above Manchester United into second.
Vardy and Mahrez, who both starred in Leicester’s stunning title triumph in 2016, are enjoying productive seasons at the King Power, scoring a combined 18 goals.
Fabregas is well aware of the threat the duo can pose, but says nothing but three points will be satisfactory this weekend.
‘You are talking about Chelsea FC, you have to win,’ Fabregas told Sky Sports. ‘They demand you to win, you have to demand yourself to win.
‘The manager wants you to win, this is our obligation. It will definitely be difficult, we know how they play and like to play with two lines of four.
‘They are very compact and have [Jamie] Vardy and [Riyad] Mahrez, who are top players, and they play the counter-attacks very well.
‘So we just have to keep an eye on them and be ready to play our game and hopefully win.’
Fabregas, 30, also conceded it is unlikely that Chelsea will defend their Premier League crown, with City pulling 15…