The following players have all been released: Cuco Martina Lloyd Isgrove Harley Willard Martin Caceres https://southamptonfc.com/news/2017-05-25/southampton-2017-retained-list-players-released
(Already read a comment on a EFC forum where someone called him Cukoo Martina, and someone got really upset because they thought it was a racist joke about leaving your babies behind (WTF?????????) so the meltdown has already began, and he's not yet signed!) Tobes will have to go double time on the ambition drum to paper over this.
It's difficult for someone like Isgrove trying to break into a Premier League team. Maybe he's simply not good enough but I'm sure he would have had his chance had we still been a League One side. He may well have developed into a decent player. A move should do him good.