Jose Mourinho fears Marouane Fellaini will leave Manchester United in the summer as contract talks continue to drag on.
The 30-year-old has endured a difficult relationship with United supporters at times but has become an influential player under the Portuguese.
That form was recognised as the Red Devils triggered the one-year extension in Fellaini's contract at the start of the year, but agreeing a deal beyond the summer is proving difficult.
Press Association Sport understands United have no intention of cashing in on the midfielder in January despite talks stalling and a contract being rejected at the start of the campaign. Sky Bet offer 5/6 on the midfielder to stay or leave United.
Asked if he was worried that Fellaini would not be here next season, Mourinho said: "Yes, I am."
When asked if there was anything he could do to turn it around, the United boss added: "Nothing. It is a discussion between the player and the board. I am not involved in contracts, in deals. And I respect both.
"I respect the player because the player has the right to decide his future. He finishes his contract, he has the right to decide his future, and I respect the board because the decisions and the discussions are under their control.
"So I just wait, wishing that they will have an understanding but it's out of my control."
Besiktas are 13/8 favourites to sign Fellaini, with Paris St Germain (7/2) also reported to hold an interested in the Belgium international.
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