Chelsea will be considered strong favourites to extend their formidable unbeaten run under Thomas Tuchel and win to give themselves a four-point cushion in fourth spot before rivals West Ham head to Wolves on Monday night.
The miserly Blues are gunning for an eighth successive clean sheet across all competitions, having conceded just twice under their impressive new manager so far.
West Brom have a tough task ahead this afternoon with time quickly running out in the fight to avoid relegation to the Championship.
Sam Allardyce’s goal-shy side have won just one of their last 11 league matches and currently sit 19th, 10 points adrift of safety with only nine games left to play this season.
Follow Chelsea vs West Brom live, with updates from James Robson at Stamford Bridge…
80 mins: An important intervention from Johnstone as Kovacic attempts to release Werner.
Into the final 10 minutes at Stamford Bridge. Can Chelsea at least get one more to set up a grandstand finish?
77 mins: Werner is somehow denied a free-kick after a clear push by Bartley just outside the box.
West Brom are soon on the attack again in this crazy spectacle and Phillips wins a corner that is headed over by Yokuslu.
74 mins: Tuchel has thrown on Kai Havertz in place of Jorginho.
West Brom fire wide at one end before Zouma misses a sitter at the back post!
GOAL! Chelsea 2-4 West Brom | Mason Mount 71′
71 mins: Chelsea hit back to give themselves hope!
Werner unselfishly squares the ball for half-time substitute Mount to ease home from close range.
Can they pull off an incredible comeback?
GOAL! Chelsea 1-4 West Brom | Mbaye Diagne 68′
68 mins: Incredible. The Baggies are in absolute dreamland.
It’s another brilliantly-worked, incisive move featuring a smart backheel and Galatasaray loanee Diagne is on hand to stroke into the bottom corner.
James Robson at Stamford Bridge
I’ve never liked the way Allardyce has been derided. There’s more than one way to play football – and he has had a wonderful career playing it his way.
West Brom thoroughly deserve their lead here and it could get a lot worse.
64 mins: Frustration for Kovacic as he is booked for a reckless challenge on Townsend.
An argument for another red there?!
GOAL! Chelsea 1-3 West Brom | Callum Robinson 63′
Robinson comes back to haunt Chelsea again with a smashing volley that rockets past Mendy after a lofted pass from the overlapping Furlong.
10-man Chelsea with a mountain to climb now.
Tuchel’s unbeaten run is under severe threat…
60 mins: Mendy makes a smart save with his legs to deny Pereira a hat-trick after Chelsea’s 10 men are cut open.
57 mins: Azpilicueta brings the ball forward into midfield and combines well with Kovacic, who shifts it past Ajayi and onto his right foot before his powerful drive is deflected wide.
Zouma’s cushioned half-volley from the corner under pressure from Ajayi goes over the top.
Plenty of chances coming for Chelsea’s 10 men now.
55 mins: Mount successfully deceives Johnstone by looking like he’s going to curl his free-kick to the back post before quickly attempting a bending strike to the front post that goes into the side netting.