Pep Guardiola admitted Manchester City was "not prepared" after a stunning 2-0 loss against struggling Southampton in the League Cup quarterfinals on Wednesday.
Guardiola's side paid the price for a limp display and never recovered after first-half goals from Sekou Mara and Moussa Djenepo at St Mary's.
City sits second in the Premier League standings, while Southampton is languishing at the bottom of the table.