City won 3-0 on Sunday, with O'Reilly outstanding in his battle with Mohamed Salah on the night.
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He told City's website: “I’d say a very good win. Very important to get the three points against tough opposition.
“Reigning champions coming to our place so we knew we had to give them a tough game and we did.
“We’re all buzzing with the three points.
“I thought we were solid from back to front all around the pitch. I think everyone dominated their opponent.
“You can’t go wrong when you do that.”
