The Belgium international completed his move to the Premier League champions on transfer deadline day, adding some strength to the club's midfield options.
The 25-year-old has developed a reputation as a tough-tackling midfielder in his five years at Everton, and Crerand believes that he can be another star in the long line of fine midfielders at Old Trafford.
"I'm delighted United have signed Marouane Fellaini and I think most fans should be too, because the one thing we've lacked at Manchester United in the middle of the park is somebody powerful and strong," Crerand told the club's official website.
"I wouldn't want [Yaya] Toure playing against me; a big powerful guy, hard to compete with. We've got one of our own now."
"Down the years, we've had some magnificent players in midfield, like Roy Keane and Bryan Robson. And now, with Fellaini, we've got much more power and strength than we had last year, so I think he's a big asset."
Fellani made 177 appearances for Everton, scoring 33 goals in the process.