During Chelsea's shock defeat, Mourinho had cause to speak to a ball boy in stoppage time after feeling the ball was being returned too slowly.
He said: "I told him not to do that because he has the risk of one of my players punching him or losing his temper.
"I went there to stop Cesar Azpilicueta because he's an emotional guy.
"I was afraid Azpi might push the kid or do something, so I went there. The kid was cute. I told him, 'If you do this, one day somebody will punch you!' He nodded his head."
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