Pep Guardiola kept his Manchester City players locked in the dressing room for almost an hour after their disappointing draw against Southampton.
City moved to the top of the Premier League but had to come from behind after an unhappy Guardiola again saw his side shoot themselves in the foot in the first half.
A poor back-pass by John Stones gifted Nathan Redmond the opening goal and it took an equaliser from 20-year-old substitute Kelechi Iheanacho to save City from defeat.
It meant Guardiola moved to five games without a win for the first time in seven years and the strict former Barcelona and Bayern Munich boss kept his stars back afterwards.