Coached by Ole Gunnar Solskjaer and Warren Joyce they have won the trophy for the first time in four years after Liverpool lost to Everton on Tuesday night.
United manager Ferguson is thrilled with their achievement and praised the mentality of Northern Ireland Under-21 midfielders Oliver Norwood and Corry Evans.
“Some of the players have done very well. In the 1-0 win against Liverpool, the back four were absolutely brilliant, they really did well. One or two younger players are developing quite well. Gabriel Obertan scored an unbelievable goal.
“Oliver Norwood and Corry Evans do really well and have a good attitude towards the game. That’s an important thing and Ole and Warren have maintained that attitude right through the team.”
Ferguson added: “I’d like to say congratulations to Ole and Warren. They’ve done a great job. Whenever we’ve appointed a new reserve team coach, I’ve always explained to them what a difficult job it is because it’s subject to what I need.
“I may pull out three or four players from a training session or I might say, ‘these players can’t play for you on Thursday because they’re on standby for me on Saturday’.”