This time they will be playing in Italy and is much different from Chelsea,we have seen in the Premier League that Chelsea has not been doing that well when playing away and the new coach sure has started with the right foot by winning against Crystal Palace away but in Champions we have yet to see a win outside home for Chelsea.I believe Milan will play much but much better in Italy in front of their home fans which are expecting a victory from Milan in order to turn things around and to be able to get a spot past the group stage.
One thing that makes me feel confident for Chelsea who are unlikely to lose in the away match against Milan is about their new coach, Graham Potter seems to have a good ability because so far Chelsea have not lost after changing coaches. With a result like that it is very likely Chelsea will maintain this kind of performance at least not to lose points, a draw could be their target at the San Siro. I also don't think Milan are weak because so far Milan have had good results when playing at home, but when the Chelsea defense is at its best then the result is clean sheets for Chelsea because Chelsea have a good and strong defense.
No doubt Graham Potter doing good job, and now they are at winning road which is important for them but here we have to praise Thomas Tuchel as well because he has also done good work and have quality players which are now helping new coach for having better results even we can expect some changes in coming transfer window because every coach want to play with his favourite players and same can happen in this case after very good performance against AC Milan at home most chances they will be good in away match as well which will give them positive result.
Chelsea have two back to back clean sheets one against Wolves and second against AC Milan both were at home, but now their defence is surely doing good job which is surely going to help them for having more positive results in coming matches in both leagues which will give them better position for staying in hunt for better spot.