Schneiderlin's future at St Mary's looks increasingly unlikely with Manchester United pushing for a deal, although they have already had one bid rejected by Southampton.
However, Southampton's next potential signing of FC Twente defender Cuco Martina is to provide cover for injured Ryan Bertrand who has recently undergone surgery on both knees.
“We are working to sign another defender and the rest is up to the situation on Toby [Alderweireld] and Morgan [Schneiderlin],” Koeman said.
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Ronald Koeman is hoping to secure a deal for FC Twente defender Cuco Martina
“We are interested in the player (Martina) because Ryan had a small surgery ten days ago on both knees and he will be out for the coming weeks.
“The number of defenders we have is too small. We need more competition.
“Martina is available in three or four positions in defence. That gives us more players, more defenders to play a tough season.
“It’s difficult (Bertrand’s injury), it’s always difficult but around five weeks.”
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