Ole Gunnar Solskjaer urged Manchester United to become more ruthless, admitting they have been better in penalty shoot-outs than in proper games.
The Red Devils needed spot-kicks to overcome League One outfit Rochdale after a disappointing 1-1 draw in their Carabao Cup clash at Old Trafford on Wednesday.
Juan Mata, Andreas Pereira, Fred, Mason Greenwood and Daniel James all converted penalties in a 5-3 shootout win.
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Solskjaer called on his team, who also beat AC Milan on penalties at the International Champions Cup in pre-season, to be more aggressive in building on a lead.