The 27-year-old was signed by Koeman at Southampton - could he follow him to Everton?
Southampton and Stoke City went head-to-head this week.
Everton were linked with a move for the Southampton right-back in the summer.
Southampton are reportedly planning to land Laurent Jans in January.
Well done to anyone who reached the end of Hapoel vs Southampton. It wasn't easy. But we did it. And, bizarrely, there's still plenty to learn.
Following impressive performances from several players during Southampton's 3-0 hammering of Sparta Prague, Claude Puel is faced with a serious selection headache.
Claude Puel's Southampton side were comfortable victors in their Europa League tie against Sparta Prague, in a game that saw Charlie Austin and Jay Rodriguez return to the scoresheet.
A select round-up of the latest news relating to Everton…
Jeremy Pied's injury could scupper Everton's move for Southampton defender Cuco Martina.
An injury to Jeremy Pied has left the Saints needing to reassess their options.