Southampton have asked about a loan deal for Marseille right-back Pol Lirola.
The 24-year-old former Spain U21 international is viewed as a defender who can cover for Kyle Walker-Peters.
Southampton have fielded interest in Walker-Peters from clubs such as Chelsea but value the 25-year-old at £40m.
Thomas Tuchel remains keen to rebuild his back four and the right wing-back spot remains an area of his concern despite appearing to possess a bit of depth in the area.
The Spanish right-back is at Marseille after spending five years in Spain with Juventus, Sassuolo and Fiorentina.