The winger has just signed for West Ham this summer from the Hoops.
He told West Ham TV after the 6-2 win: "It was a brilliant moment for me.
“I've worked hard this pre-season, I got gifted this opportunity which I'm grateful and I was just really excited to come on and I was happy with the goal.
“I think I found out about the [Celtic] fixture after I signed, but once I saw the fixture I was like 'I need to make the squad!' so I was happy I made the squad and I'm grateful for the opportunity."
“Today was a special day. In Scotland, the rules are still tough, so they only had 18,000 when they usually have 60,000 here. It was always special to come and play here and I just happened to get on the scoresheet and that's something I've been working on, so it's just nice to score."
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