Key for City heading to Stamford Bridge though is their form defensively, where they boast the best defensive process in the Premier League, allowing just 0.56 xGA per game. Manchester City were surprisingly held to a goalless draw by Southampton last weekend, though they did create enough chances to warrant the victory ( xG: MCI 1.47 - 0.42 SOU). We have seen improvements in attack too, with the addition of Romelu Lukaku having the desired effect. Defensively they are immense, allowing over 1.0 xGA (Expected Goals Against) only twice this term - at Anfield and in a 3-0 win over Aston Villa - picking up from where they left off last season. Thomas Tuchel's side were excellent at Spurs last weekend, blowing their hosts away in the second half to record an easy and deserved victory ( xG: TOT 0.78 - 2.49 CHE). As for Chelsea, they have already played three of last season's top eight and have the opportunity with a win here to pull six points clear of City. What a huge game this is, particularly for Manchester City who have a tough week including this game, facing Paris St-Germain in midweek before a trip to Anfield next weekend. CLICK TO READ: Has Tuchel overtaken Guardiola?.Correct Score: Chelsea 1-1 Manchester City