Mauricio Pochettino’s side were beaten at the Riverside Stadium earlier this month and now trail Championship side Middlesbrough by a single goal ahead of this evening's semi-final second-leg tie at Stamford Bridge.
It was another game where the Blues missed a number of good chances and they will need to ensure they find their finishing touch if they are to avoid what would surely be a season-defining disappointment.
Here’s everything you need to know about where to watch the game tonight.
Where to watch Chelsea vs Middlesbrough
TV channel: The game will be broadcast live on Sky Sports Main Event, Sky Sports Football and Sky Sports Ultra HDR in the UK. Coverage starts at 7pm GMT ahead of an 8pm kick-off.
Live stream: Subscribers will also be able to watch on a live stream online via the Sky Go app.
Live blog: Follow all the action with Standard Sport’s dedicated live match blog. Nizaar Kinsella and Dan Kilpatrick will be providing expert analysis from Stamford Bridge.