Everton are closing on Nikola Vlasic from Hajduk Split in a deal worth £8million plus bonuses.
The 19-year-old earlier this summer and he impressed during their recent Europa League tie.
However, the Croatia Under 21 international may be sent out on loan should he sign.
Everton have also expressed interest in Porto defender Ivan Marcano.
The Toffees will reject offers from Olympiakos for Kevin Mirallas who was dropped on Sunday.
The Belgium international has upset Ronald Koeman with his attitude following his substitution against Hajduk Split.