But after months of speculation and a prolonged period where it seemed as if his time at the club as over after five years, Man United announced on Friday afternoon that Fellaini had agreed a new two year contract.
The 30-year-old had this to say about the deal: "I am pleased to be continuing my journey as a Manchester United player".
"I made this decision because I am very happy here", Fellaini said.
"There's always a lot of exposure on Fellaini - people saying 'he's not a United midfielder" - but the reality is he does contribute throughout the season and you need all different types in the dressing room.
The 30-year-old Belgium global joined United from Everton in 2013 and has made 156 appearances and scored 20 goals, winning the FA Cup, League Cup and Europa League.
"I think Jose Mourinho has figured out it's better to have in your team than against you".
The announcement makes it less likely Mourinho will look to sign another midfielder this summer after already sealing a deal for Brazilian Fred.
"I am very happy Marouane is staying with us", said Mourinho.
"I always believed in his desire to stay with the club and I am delighted that he has signed a new contract".