Sagna sustained the injury in the 2-0 win over Napoli in the Champions League on Tuesday.
The France international managed to play the while game, but the injury will see the defender miss the Premier League clash with West Brom on Sunday.
The injury is also expected to see Sagna miss the games against Norwich, Crystal Palace and the Champions League clash with Borussia Dortmund.
What is your opinion? Feel free to discuss the article under. You have to comment by using your Facebook profile. Be fair and have respect for other people and opinions!
Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?