Newcastle head coach Eddie Howe was admitted to hospital on Friday and will miss Sunday's clash with Manchester United as a result.
Howe was absent for media duties on Friday, having been struck down by the an unspecified illness, and was replaced by assistant coach Jason Tindall.
Tindall told reporters: "He's been really poorly in the last couple of days but we've been in daily contact.
"We've been speaking three or four times a day so it's not affected any of the preparations."
The Carabao Cup winners on Saturday said their 47-year-old boss had been feeling unwell "for a number of days" and would not be at St James' Park on Sunday. It is expected that Tindall will lead the team against United.
A statement added that Howe was "conscious, talking with family and continuing to receive expert medical care".
Assistant Jason Tindall and coach Graeme Jones will take the side on Sunday, with Newcastle adding: "Everyone at Newcastle United extends their best wishes to Eddie for a speedy recovery, and further updates will follow in due course."
