Fellaini netted his ninth and tenth goals of the season on Saturday, as the Toffees came back from 3-1 down to earn a draw against Aston Villa at Goodison Park.
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But Mirallas has claimed that his fellow Belgian's contributions do not overshadow the work of "the collective" for the Merseyside outfit.
"Fellaini scored two vital goals and rescued this point for us. He is very important and has had a fantastic season," Mirallas told reporters.
"But it is also all about the collective here. If we do snatch the last Champions League place it will be down to the group."
The 25-year-old, who provided an assist for Victor Anichebe to net in the first half, also lauded the spirit shown by Everton in turning things round.
He added: "At 70 minutes when we were 3-1 down, things looked tough. Villa played well. But we have worked hard to get to fifth place and we are doing all we can to reach fourth.
"If we are going to grab the last Champions League spot we are going to have to keep fighting like that."