United boss David Moyes is a big admirer of Fellaini, having worked with the 25-year-old midfielder during his time in charge of Everton.
Fellaini isn't the only former charge who Moyes would like to bring to Old Trafford either - Moyes' £28 million joint bid for Fellaini and left-back Leighton Baines was rejected by the Goodison Park outfit, with Everton chief Roberto Martinez desperate to keep hold of his two most prized assets.
Moyes is yet to make a marquee signing since replacing Sir Alex Ferguson at the helm of the Red Devils, and he faces a fight to land Fellaini or Baines - despite reports suggesting the former is keen to push through a move.
According to the Daily Mail, Fellaini would like to move to a top Premier League club before World Cup 2014, with fears over his potential value ahead of next summer's tournament.
Belgium - strongly tipped to enjoy a successful World Cup campaign in Brazil - are on the verge of qualifying for the showpiece event and boast a string of top quality players, including Premier League trio Eden Hazard, Vincent Kompany and Jan Vertonghen.
And Fellaini is reportedly concerned that another successful season on Merseyside could push his price tag up even further, leading the former Standard Liege star to believe a summer switch to be in his best interests.
Fellaini - who has been at Everton for the past five years - remains keen to secure a move to Manchester United, though it's unlikely that he'll hand in a transfer request to push through a move to Old Trafford.