The Hammers won 1-0 thanks to Crysencio Summerville's strike in extra-time.
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"It's an absolute honour to captain this Club, this team. It's a special day for me as well,” Mavropanos told the club's website.
“I think it was a hard game. In this competition, every opponent can be tough. This is what happened here today as well. We give credit to them.
“At the end, I think with our goal, we tried to manage better the game and score and make some more chances, and we are through.
“You have to adapt to that, mentally especially. But as we said before, it's a game where you have to show character, and this is what we did.”