Duo Expected to be Fit for Chelsea to Face Middlesbrough

Chelsea are on a five game winning run in the Barclays Premier League and it will be intriguing to see if they can extend the streak when they face a hard working Middlesbrough side away from home next weekend.
The Blues have not conceded a single goal since they were thrashed by Arsenal on 24th September. Can they keep another clean sheet against Boro? We shall see?
Middlesbrough have earned 5 points from their last three league games, 2 against big guns like Manchester City and Arsenal away from home. Therefore, Antonio Conte must not take Boro lightly.
As far as Chelsea’s team news is concerned, four players in the form of Loftus-Cheek (Knock), Costa (Groin), Zouma (Fitness) and Fabregas (Thigh) are out injured at the moment (PhysioRoom).
As per the provided PhysioRoom link, the likes of Cesc and Kurt are expected to be fit for the game against Middlesbrough. However, it is highly unlikely that the duo will start because the team is doing pretty well without them.
Costa is currently the top scorer in the Premier League and his absence will surely be a major concern for Conte.