Not only is it difficult match but defeat is clearly in sight because up to now no one has been able to beat Tottenham, now Chelsea is a big opportunity for Tottenham to go higher in terms of points and remain safer in maintaining first place.
As I said before only luck can help Chelsea match or even beat Tottenham but it seems impossible for Chelsea to have that luck.
Chelsea, like Manchester United are in their worst condition this season.
These two teams used to be giants from England but as time went by they fell behind and even this lag made quite lot of fans very disappointed.
Whether there will be changes in the future or not, we can be sure that the coaches of these two teams will experience the most difficult phase in improving a football team.
Chelsea used to win vs Spurs in their latest games but time has changed a bit lately with Spurs rising good and Chelsea drowning. Spurs expected to win this game and I think it is the case. I doubt it will be a hard match unless Spurs were doing bad, they used to do Spurs things from time to time

I don't know if changing coaches only will help fixing Manchester United or Chelsea problems but it will happen eventually with the bad results they have..