The Stade de Reims midfielder is set to join the ambitious Championship side.
The winger left the relegated Magpies to join Crystal Palace earlier this summer.
The Saints kick off their Premier League campaign at home to Watford, but what starting XI will new manager Claude Puel pick?
The Argentine striker has signed on a loan deal until the end of the season.
Wolverhampton Wanderers are still on the look-out for a new striker, and West Bromwich Albion's Rickie Lambert could be the ideal signing.
Leeds United lost to Queens Park Rangers in the Championship last weekend.
Newcastle United manager Rafa Benítez confirms wantaway midfielder Moussa Sissoko will be in the squad for Saturday's Championship match against Huddersfield Town.
Manchester United youngster Jesse Lingard has spoken about his first few weeks working under new manager Jose Mourinho.
He would not however confirm if a deal was near completion.
Preston North End and Birmingham City are understood to be interested in signing Newcastle's Kevin Mbabu on loan.