Crystal Palace are hoping to find a club willing to take talented teenager Sullay Kaikai on a short-term loan.
Fernando Torres says it was his decision to leave Chelsea and claims a return to Atletico Madrid was never discussed.
Tankovic joined the London outfit in 2011 when he was 16 years of age and made his debut for the Cottagers in the 2013/14 campaign.
The 19-year-old Swede featured in three Premier League games for Fulham, but was not offered a new contract when his original deal ran out.
Dutch club AZ have now recruited Tankovic on a contract that runs until June 2019.
AZ have also signed Guus Hupperts from Roda JC, who suffered relegation from the Eredivisie at the end of last season.
The 22-year-old winger cost the Alkmaar-based club for approximately €1million and has signed a contract that runs until June 2018.