The Belgian midfielder has been buoyed by the summer signings of Steven Naismith, Kevin Mirallas and Bryan Oviedo and the permanent return of Steven Pienaar to the club and feels that David Moyes has a squad capable of winning some trophies this season.
"It shows the club has ambition and wants to win something," Fellaini told the club's official website.
"The FA Cup or the League Cup [are possibilities]. The league is difficult because of some of the clubs in England but it shows we want to win something and also qualify for Europe. New players have come here because they want to win things and play in Europe.
"This is the best squad since I have been here. The boss has kept players and signed good players. We'll do our best to win a trophy."