When Ronald Koeman arrived at Barcelona, one of the decisions he made right away was changing the formation from a 4-3-3 to a 4-2-3-1.
So far the new system has had mixed results with strong performances in the Champions League, but an inability to produce wins in La Liga, with the loss to Atletico Madrid on Sunday dropping their record to a paltry 3-2-3.
For Barcelona, make no mistake, this defeat was consequential, and it confirmed the need for significant changes going forward. The pressure is on for Koeman to show he can take responsibility for the problems that are the result of decisions he himself has made, and it can start with considering the benefits of a formation change.