There's more on BBC Wales.
https://www.bbc.co.uk/sport/football/teams/cardiff-city
“Club president Hasan Arat said the new coach could be Turkish or foreign – he said it is a very important choice and added that they will not rush,” Samet Cayir of Turkish sports publication Fanatik explained to BBC Sport Wales.
“And Erol Bulut is among the options for Besiktas. However, I don't think there is much chance of this union.
“One, because Bulut worked at Fenerbahce in the past and the team did not become champions. Also, Erol Bulut is not a high-tempo and offensive coach.
“Santos' playing philosophy was deemed too defensive and the Portuguese coach was criticised a lot.
“Besiktas fans want a more offensive coach like [former manager] Şenol Guneş. The club will take this into consideration. That's why Erol Bulut is difficult.
“His time at Cardiff is being followed in Turkey and some people think he is in a really good moment, but at the moment he is not a preferred coach for the big clubs here.”