Besiktas hope to have a deal for Everton's Dele Alli finalised so that he can be in the stands for their game against Fatih Karagumruk on Sunday.
The Turkish club are eager to complete a deal by the end of the week and it is understood the Toffees could be willing to let Alli leave — despite having joined the club only in January.
Whether Besiktas can pull off the transfer depends on how the deal is structured, with the Turkish club preferring an initial loan deal.
The potential deal moved a step closer to completion on Thursday night with the two clubs actively engaged in talks.