- Fellaini's contract is due to expire at the end of the season
- United are yet to reach an agreement with Fellaini's camp over the contract extention
- The former Everton man has scored four goals in eight starts for the club this season
Belgium international Fellaini signed an one-year contract extension in January but his current deal expires at the end of the season.
The Manchester United boss has admitted he is "worried" about Fellaini's contract stand-off.
While Mourinho also revealed that he is more concerned about the former Everton midfielder becoming a free agent than out-of favour full-back Luke Shaw, whose contract is also nearing its end.
Fellaini stalling a new contract with Manchester United. Source: SUN
He said: "I'm worried about Fellaini and not about Luke Shaw because Fellaini finishes his contract and Luke Shaw doesn't."
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Having initially struggling to make a stamp in United's squad following his £27.5 million move from Everton in 2013, the Belgian has become a key part of the Red Devils team.
Fellaini scored four goals in eight starts for the club this season before suffering a knee injury while on duty for Belgium against Bosnia and Herzegovina on October 7.
Fellaini in action for Manchester United. Source: SUN
Mourinho is reluctant to lose anyone on a free next summer and wants to make sure he can at least get cash for any players who don't fit into his plans at Old Trafford.
Jose Mourinho's men has suffered a dip in form since the injury of the Belgian international, NAIJ.com had earlier reported that Manchester United dug deep to earn all three points against in-form Tottenham Hotspurs with super substitute Anthony Martial scoring a late winner.
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Source: Sports.naija.ng