Euro 2016 winner Cedric Soares has signed a new four-year contract with Southampton.
The 24-year-old Portugal full-back is expected to command an important role under new Saints boss Claude Puel, especially with Jeremy Pied sidelined through knee trouble.
Cuco Martina could move to Everton once Pied recovers, though Saints are waiting to determine the extent of Pied's problem before sanctioning that transfer.
Saints are still expected to bring in Lille forward Sofiane Boufal before the end of the transfer window, while the south-coast club also recruited goalkeeper Stuart Taylor on a free transfer on Friday.
"Since his arrival at the club Cedric has gone from strength to strength, ending his first season in England with a memorable Euro 2016 for Portugal this summer," said Southampton's executive director of football Les Reed.