The Wales midfielder is enjoying career best form this season, but concerning for Fulham is his contract continues to run down.
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Wilson can leave at the end of the campaign as a free agent if the situation remains and Silva concedes little has changed in recent weeks.
He said: “I don’t know if I am going to have him in one week, 15 days, three months or at the end of the season, with good or bad news. I cannot guarantee anything."
Wilson was again outstanding for Fulham in Saturday's FA Cup win against Middlesbrough.