Two banners were unfurled, one calling for him to 'get out of our club' and another reading 'sack the board'.
On the supporter who charged towards him, Benitez said: "I didn't see the fan. I was concentrating on the game. After I saw someone was in the middle of the pitch but that's it.
"We are really disappointed because we lost. We are disappointed because the fans have been travelling to support the team and it's not the ideal situation.
"But we cannot change this situation now. We have to learn because we cannot make these mistakes in the future."
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