According to Fussball transfers (translated by Sportwitness), the midfielder has completed his medical with the Magpies and the paperwork should be finalised soon.
As per the report, Newcastle will sign the former Spurs player on loan with an option to buy. If they want to make the move permanent, they will have to pay €10m.
It will be interesting to see how the 25-year-old performs during the second half of the season. If he manages to adapt quickly and impress Steve Bruce, Newcastle might just trigger the option to sign him for the long term.