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Kevin De Bruyne has said Manchester City spent only 15 minutes working on the system change that led to their 3-1 win over Manchester United in the Carabao Cup semi-final first leg on Tuesday.
Pep Guardiola sprung a surprise ahead of the Old Trafford clash when he named strikers Sergio Aguero and Gabriel Jesus on the bench and played De Bruyne and Bernardo Silva as false nines.
In contrast to December's derby at the Etihad Stadium, when Guardiola played a 4-3-3 and saw his side torn apart on the counter-attack in a 2-1 defeat, the plan worked brilliantly.