It's really baffling how some of you choose to attack him, Valvarde is trying his best and is being the opposite of what Lucho is; Stubborn, he saw right from the get go that a 4-4-3 does not work and worked on to change it in the second game to fix Messi's positional play to not effect the team.
Had he stayed with the 4-4-3 we would of still lost and he would of still got the blame, even when he tried a completely new approach to our game in the 3-5-2 he's still getting the blame in a game we were already losing.
Yes, he has his own little flaws, like not starting Semedo and playing Vidal over him, perfering to start Andre Gomes over Alena or any of our favorites. However, didn't Lucho come up with bizzare lineups at the start of his first season and benched Rakitic for an old Xavi that had no legs?
It's clear he's trying to work with what he has avaliable, everyone should lay off the blame, he's clearly doing his best and discovering who's suitable for his system and who is not that good, just like Lucho's first season, Valvarde will take a while to understand which players works in the best position.
Let him cook, he'll eventually stumble back into his own 4-2-3-1 which he understands the best.