Rolando Aarons has suffered an injury in tonight's EFL Cup tie against Cheltenham Town.
The winger was forced off early in the game after pulling up.
Aarons – who has signed a new long-term deal at the club – was wheeled down the tunnel on a stretcher.
Striker Aleksandar Mitrovic, back from a four-game ban, had to be substituted later in the first half after suffering a cut above his eye.
Newcastle led 1-0 at the break thanks to a goal from Ayoze Perez.
For news and updates from tonight's game, follow our live blog here.