"Knowing what we know now, I know everyone is saying can we get a bigger cushion going across there, but they're a technical team, they're very well-organised, they're hard to break down, so it's a brilliant win.
"I'm so proud of the players and we absolutely can't wait for next week already.
"We travel Tuesday to get there early and prepare and it's the most exciting time of a lot of our players lives, so I'm sure they're high as kites."
"I'm the proudest man in Ireland tonight. I've said many times before that playing football for Ireland and playing in England for many years was great, but nothing has made me prouder than managing Shelbourne. It was a great night."
Reflecting on the perfect start, Duff added: "It was an amazing start to the game and an amazing return to European football. Eighteen years and then you score within 25 seconds! It's fabulous and I'm really pleased for Mark."
Shelbourne's focus now shifts to the second leg at Europa Sports Park, where Derry City suffered a shock 2-0 defeat to FCB Magpies on Thursday night.
"We'll have to respect the heat, the pitch and the conditions next week, and respect the opposition, obviously," the 45-year-old manager said of next week's game.
"I think people hear 'Gibraltar' and they maybe slightly disrespect them, but 90% of the team are Spanish. Spanish footballers, as we know, have wonderful technique.
"We'll recover, we'll review and we'll gradually ramp it up to next week.
"We travel Tuesday to get there early and prepare and it's the most exciting time of a lot of our players lives, so I'm sure they're high as kites."
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