Aluko has been linked with transfer bids away from the Craven Cottage having garnered nine goals in 50 games for the Cottagers last season.
The Super Eagles forward joined the west London club last summer and his boss has declared that he will fight for him with a likely contract extension.
"In this moment the only job that I can do is to fight for Sone Aluko because around me there is some news that we are thinking about selling him,” Jokanovic told BBC Radio London.
"If we do this it will be big mistake for my team.
"Ultimately, it looks likely there could be a contract extension, the club have had multiple bids for him and have rejected them."