Erling Haaland and Jeremy Doku struck for City in their 2-0 win.
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“I enjoyed it a lot, it was a special night,” said O'Reilly.
“To play in the Champions League, the highest competition and biggest level so it was amazing.
“They (my family) were all here to watch and they’re super proud. It’s always important to start off with a win in the competition, it puts us in a good place.
“Also to get a clean sheet. Going into the weekend we’ve got momentum and we’ll just do our best (against Arsenal).”