I dont get this obsession with formation 442, 433, 4312, etc. To me its more important player selection... Current group of players wont magically play better if we switch between few formations, lets say Costa drifts more to the wide than staying in the middle. Do people seriously think this little change will put us in better position to win CL? We need better midfielders, we need to close the gaps in our defense that has been leaking goals left and right, while top 3-4 can occupy any of the roles they feel like and its never as strict. I mean when the time comes, or important CL games and if you keep fielding Matuidi, if Pjanic will still look like retiree, if our defense wont be composed and organized, if Woj will keep making blunders, etc...
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Obviously its about players, just look at the midfield we had back then and then look at the scrubbs we have now. Erikssen was a good opportunity and we should have invested more of our effort to lure him here.