The £30million-rated Serb striker is wanted by a host of clubs across Europe, including Real Betis.
But Khan wants him to lead the Cottagers promotion push next season.
“We made a big investment to get him here and I believe in him. Last season he played so hard for us and he sets a great tone in the dressing room and on the pitch. I am doing everything I can to keep him.
“I have a great relationship with him and we have had a lot of talks. He loves Fulham, he loves the club, he loves the people here, he loves his team-mates."
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