Newcastle have agreed a fee to sign defender Massadio Haidara from Nancy, according to the French side.
The 20-year-old left-back is to have a medical at the St James' Park club before completing the move.
"After 46 games and two-and-a-half years in the Nancy shirt, Massadio Haidara is leaving for Newcastle," said a statement on the Nancy website.
"The two clubs have reached an agreement and will finalise the transfer on Tuesday."
Nancy are currently bottom of Ligue 1 and Haidara has made 17 league appearances for them this season.
The player has also represented France at Under-20 and Under-21 level.