Newcastle have agreed a deal worth up to £3m for West Ham defender Harrison Ashby.
The 21-year-old Scotland Under-21 international, who joined the Hammers as a youngster and has made seven appearances for the senior side, will have a Newcastle medical on Monday.
His contract is due to expire in the summer and he told West Ham he was not willing to sign an extension.
Newcastle manager Eddie Howe has ruled out selling French winger Allan Saint-Maximin, 25, during the January transfer window, which closes on Tuesday.
"He's here to stay," said Howe. "He's an integral part of my team.