Rashford is going to be out for an extended period (2-3 months it seems) with a double stress fracture in his back. He's been playing injured, it seems, and worsened it to the point that he can't go on. A big blow for United, but they have been leaning heavily on him and he is still young.
The England forwards are dropping like flies...Danny Ings is surely going to get a shot at another cap now?
Much is being made of Klopp, the players, and many Liverpool's fans' unwillingness to relax (me included) in the face of an (admittedly) big lead at the top of the table, but Liverpool were one point short last season and failed to win the CL final the season before that. And let's not forget the infamous slip, though that was not, in reality, all that meaningful except in terms of narrative. No less a person that Roy Kean was crowing about all that just this morning. Virgil van Dijk said after the game:
"I think everyone wants us to say something about it but we won’t. We won’t get carried away. We cannot, and we won’t. I think what we experienced last year is something that made our mentality like this. We just want to go one game at a time, try to stay fit, try to improve."
...and I think that is the right attitude. If Klopp intends to take Liverpool as far as they can go this season, whether that be the title, a double, whatever - this is the mentality the players must have.