Sporting demand €30 million for Leicester target Slimani
The Foxes have been told to up their offer if they want to land themselves with the striker's services this summer.
Leicester City have been told to up their initial €20 million offer for Sporting forward Islam Alimani, according to A Bola in Portugal.
The club have demanded that the Foxes increase their bid by €10 million if they want to sign the striker.
The Algeria international found the net 27 times in 33 league appearances during the 2015-16 campaign, which helped take Sporting to a second place finish.
Leicester may be forced to splash out on the forward now that their star striker Jamie Vardy looks set to join Arsenal.