The People says the ¬£23.5million buy-out clause in Fellaini's Everton ¬≠contract expires on August 14.
Fellaini still has three years remaining on his Everton deal and the Goodison Park club will demand more than ¬£30m for the 25-year-old once his clause has expired.
It was former Everton boss David Moyes, now in charge at United, who insisted on the deadline when the buy-out clause was negotiated into ¬≠Fellaini's 2011 contract ¬≠extension. Having lost Joleon Lescott to Manchester City at the end of the 2009 summer transfer window, Moyes wanted to make sure Everton would not be left in a similar position and would have time to replace ¬≠Fellaini.
A source close to Fellaini said: "Marouane respects the terms of the agreement he signed with Everton and has good moral standards. It is up to the club how they act."