But another question -> what is the best site or ticker to be up2date on matchday (and afterwards)?

I prefer sofascore. They have a nice app and you can favourite teams/leagues or individual games to get notifications from them when someone scores etc.
I second this, SofaScore is really good. They have an 'average player position' tab as well, so you can see the real in-game formations.
Can't wait for Chelsea game. They have so many new signings so I am eager to see how they will look this season. Havertz and Werner are in the first eleven, Ziyech and Silva not even on the bench.
Both had minor knocks and will probably be ready for the Liverpool game. I don't expect neither of them to start though.