Besiktas midfielder Gary Medel is being linked with a Premier League return.
Sky Sports says West Ham are interested in signing Medel next month.
Hammers officials are due to travel to Turkey in the coming days to develop the negotiations.
Medel played over 30 games for Cardiff City during their time in the Premier League and could now return to England in January.
Besiktas are in need to clear their best paid players off the books due to financial struggles and released Pepe earlier this week.