Fellaini talked up the prospect of moving to Chelsea yesterday.
Mirallas said: "We definitely want him to stay.
"He's a real strength. Having Marouane in your team helps because he scares the opposition - although he doesn't scare me because we're always on the same team!"
Mirallas says 6ft 4in Fellaini also played a big part in his £6m move from Olympiakos, adding: "He convinced me Everton was the place for me."