Benitez is currently preparing the first team for today's FA Cup semi-final with Chelsea but he took time out to congratulate the youth team on their deserved success.
"I would like to congratulate the youth team for tonight's success," said Benitez.
"It is always important to win trophies and I am delighted they have gone all the way in this competition.
"I'd like to give my congratulations to the players, staff, management and everyone connected with the youth team for this victory."