I wouldn't read all that much into the impact of that result on our momentum/mentality, but the concern is to me that looked like a really tired performance today, not just physically but mentally, and the schedule isn't letting up from here.
We're getting players back soon but they will take time to be fully up to speed (I'm not sure any of Robertson, Szoboszlai or Salah are back to anywhere near their best yet), and in attack especially players are looking leggy - Diaz must be beyond the red-zone, Nunez doesn't look fit enough for 90 minutes (never mind twice a week), Gakpo is either not arsed or not fully fit/tired, and Jota is going to take time to get back to his normal level.
Reckon we might see another couple of those types of away performances - originally I was really only worried about Utd and Everton, but Fulham and West Ham could be absolute slogs as well. Could really do with some of the lads getting the international period off, but no doubt both Diaz and Nunez will be flogged for 180 minutes. At least Salah is getting a rest.