The reigning champions will go second in the league if they win this weekend because Manchester United don't play until Monday night.
And Courtois felt fans at the Bridge did not help.
The Chelsea manager has heaped praise on Vardy for his goalscoring abilities, but stressed that the west London club were never interested in signing the England global.
Chelsea were held to a 0-0 draw to Leicester City at Stamford Bridge.
Their double substitution with less than an hour on the clock highlighted the home side's struggles to find a way through this Leicester defence - even tired, those two had been Chelsea's most likely route towards a goal against the run of play in a first half dominated by the Foxes.
In Simpson's absence, Daniel Amartey is likely to play as the makeshift right-back, while Aleksandar Dragovic is expected to line up alongside Harry Maguire at the heart of defence.
"We must play with a good ambition and good play at the front".
Chelsea come into the match having kept clean sheets in their last two games.
"We will see in this game". The Hammers had improved defensively under David Moyes but they have slipped of late and their last five outings have witnessed a grand total of 19 goals, while the London side have only won once on the road all season.
The most notable incident of the entire game was the dismissal of Leicester left-back Ben Chilwell.
"I'm going to go with another draw in this game too, because Arsenal are pretty inconsistent away from home - which is a worry". From the outset he found space and repeatedly drove towards goal, although he should have done better with a fine chance from a left-wing cross that he skied into the top tier.
Evans' early header set West Brom on its way to halting a 20-game run stretching back to August, with fellow defender Craig Dawson heading in at the start of the second half.
But Chelsea soon showed signs of getting to grips with the game, Alvaro Morata pulling a save from Schmeichel after charging in along the byline, while the Dane did well to tip a fierce Fabregas drive over three minutes before half-time.