Phil Crossley is reported as saying: "It is in my jurisdiction to make sure Mr Mourinho keeps strictly in the technical area.
"But he went 10 or 15 metres down the line. That's not acceptable behaviour. I felt it was a public order issue."
The Kent official added: "Whatever his gestures meant, it could have been misconstrued and the reaction of the Liverpool fans proved that," Crossley added.
"In my report to the FA I say the police said he should leave but I'd already made my mind up."
He said: "He seemed to think he was only being asked to ensure that he conducted himself properly and went to sit down.
"But I told him 'I'm sorry, you have to vacate the area'. I didn't have any problem with him after that. He accepted it gracefully and there was no animosity."
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