Hajduk Split president Ivan Kos has indicated the club could sell star teenager Nikola Vlasic to Everton before Thursday's transfer deadline.Midfielder Vlasic, 19, has been a regular first-team player for the Croatian side since making his first-team debut at the age of 16, and reportedly attracted Everton's attention in the recent Europa League play-off tie between the sides.When asked about a possible Everton bid, Kos told Split newspaper Slobodna Dalmacija: "The transfer window runs until August 31, sometimes transfers happen a minute before midnight. We don't want to lose one per cent of our quality."We also have to think about financial stability."According to the BBC, Everton are hoping to push through a £10million deal.Such money could tempt a club who missed out on a Europa League place with their defeat to the Toffees.Kos said: " I don't like to talk about things I cannot say with certainty. We'll keep track of how things are going."