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Alexander Isak could miss West Ham United’s visit to St James’s Park – after being taken off following a blow to the head.

Isak was struck on the head by a James Ward-Prowse free-kick as Newcastle United beat Southampton 2-1 at St James’s Park – and 3-1 on aggregate – to reach the Carabao Cup final.

Eddie Howe issues Newcastle United transfer update after club reaches Carabao Cu...

Asked if the striker would miss Saturday’s home game against West Ham due to concussion protocols, head coach Eddie Howe said: “He felt a big groggy taking the ball to his head. I don’t know how bad that is, and I don’t know the concussions protocols.”

Isak, signed for a club-record £60million last summer, had come off the bench in the second half. Club captain Jamaal Lascelles replaced Isak in added time.

Howe told BBC 5 Live: "We didn't know what was going on, but we made a sub as soon as we knew Alex wasn't feeling great."

Newcastle United issue Alexander Isak update ahead of West Ham United game