Mauricio Pochettino punched his fist repeatedly into the palm of his hand in that animated way managers do when they want more from their players.
Pochettino had just seen his side secure their spot in round four with a victory that looked comfortable on the face of it.
But as he assessed what had gone and what was to come, he knew the reality.
The first hour was full of warning signs ahead of Tuesday’s Carabao Cup semi-final first leg at Middlesbrough, where Pochettino believes Chelsea will need to show their next Championship opponents far more respect than they did Preston.