Chelsea defender Gary Cahill admits they'll find out about their title credentials on Monday night at Manchester City.
Victory for Manuel Pellegrini's men at the Etihad Stadium, where they boast a perfect record, will see them double that advantage.
Cahill told the London Evening Standard: "We need to get a positive result on Monday but we know how difficult it is going to be. They have put another five past Tottenham. They are banging goals and it is going to be a real challenge.
"It [drawing to West Ham] is a blow because without disrespecting them, when you're on the front foot like we were, you expect to win.
"City have won and we have dropped a couple of points.
"This was disappointing, even more so because we have been on such a good run and playing so well. We tried and tried and couldn't break them down."
